Used to...
talk about activities, actions, and events that are currently happening.
talk about activities, actions, and events that might not be happening right now, but are true right now (you currently have a habit, you do things on a weekly basis, you watch a show regularly...).
talk about facts.
talk, write, or explain in the 'dramatic present' ("The craziest thing happened last weekend. I'm walking down 5th Avenue, and then I bump into Beyonce herself.").
How to conjugate regular verbs in the present tense:
How to conjugate irregular verbs in the present tense:
Unfortunately, the present tense of irregular verbs can only be 'figured out' with familiarity. That is, there are no official rules or guidelines.
Fortunately, irregular verbs in the present tense are conjugated 'weirdly' only in the du and er/sie/es forms. The other forms (ich, wir, etc.) are conjugated how you would if they weren't irregular (just like regular verbs).
Ex. Laufen (to walk) is an irregular verb. In the first person singular (ich), laufen conjugates just like it would if it was regular- with the -e ending (laufen --> ich laufe). However, in the second person singular (du), laufen unexpectedly adds an umlaut, which makes it an irregular verb (laufen --> du läufst).
The use of future tense is pretty straightforward- to indicate things that 'will be.'
Future can be indicated in a few ways.
1) A sentence in the present can actually mean the situation in a future tense if there's an expression of time in the sentence that obviously sets the time frame in the future. Some common ones are listed below:
2) If you see a sentence with the verb 'werden' in it, achtung (attention)!
The verb werden can be used as a 'tool verb' to make the time frame of a sentence into future tense (werden can also be used as an actual verb- it literally means 'to become' and can be used in the present tense, so don't assume that any sentence is in future tense just because you see werden in it).
To turn a sentence into future tense using werden, follow this rule:
werden (conjugated) + .... + infinitive
Ex. Ich werde lesen (I will read).
Ex. Wir werden kochen (we will cook).
3) The last way to make a sentence into future tense is to use verbs that obviously refer to a future time frame.
You would conjugate these verbs using the present tense endings.
A few commonly used verbs like this are: planen (to plan), vorhaben (to plan), and wollen (to want, to will).
Wollen is very commonly used, and it is irregular. Here are its conjugations, and you should memorize them.
There are a few ways to form past tense:
1) A sentence in present tense can still refer to the past if it's written with "seit" or "schon," which are like the English word "since."
Ex. Ich arbeite seit 6 Monaten in Hamburg.
I've worked in Hamburg since 6 months ago.
2) You would use the simple past form of the verb if the verb/event happened in the past, but you're describing the verb/event as if it's still happening.
An example of when you'd do this is if you're telling your friend about what happened just yesterday: you're using the dramatic past.
The following endings are used for different types of verbs when forming the simple past.
Verbs that end in -te in the simple past have an extra-special form. These -te verbs are rather common, so a list of them is provided, as well as the ending rules for them.
It's important to memorize the simple past forms for these two irregular verbs: sein and werden.
3) The past perfect is used when you're describing an event that already happened in the past like it's already completed. It's usually used for recently completed events: recent meaning that the event is still relevant to the present.
Ex. I wrote, I did write, I have written
The way that you would form the past perfect is as follows:
haben OR sein + past participle
haben or sein? : Haben is used most of the time. Sein is only used if the past participle...
a) expresses motion
Ex. gegangen (past participle of gehen (to go))
b) shows a change
Ex. geworden (past participle of werden (to become))
Past participle
a) The form of the past participle is (almost always) ge + verb stem + -t OR -en
There are a few exceptions to this rule:
i) If the stem of the original verb ends with -d, -t, consonant + -n, or consonant + -m, the ending of the verb is -et instead of -t or -en.
ii) If the original verb ends with -ieren, you don't need ge- in the beginning of the past participle.
iii) If the original verb begins with be-, emp-, ent-, er-, ge-, hinter-, miss-, ver-, or -zer, you don't need ge- in the beginning of the past participle.
iv) If there is any other prefix to the original verb, the ge- goes inbetween the prefix and the raw version of the verb.
Ex. anfangen --> an + ge + fangen --> angefangen
4) The pluperfect is used when you're describing an event as something that happened before another past event.
Ex. I had been doing (when something else happened), I had done (something when something else happened)
The pluperfect is actually a combination of the simple past and past perfect tenses!
To form a pluperfect clause:
haben OR sein + verb
1) haben/sein must be in its simple past form (hatte/war, respectively)
2) the verb must be the past perfect participle.
You often see pluperfect clauses in the same sentence as a clause in a different tense.
Ex. Ich war traurig, weil ich mein Handy verloren hatte.
Bolded clause: a clause in the simple past
Bold and italicized clause: a clause in the pluperfect.
One of the best ways to really grasp the differences between these forms is to see a summary of them side-by-side...
Simple past: I was writing as she drew.
Why? --> You're describing this past event like it's still happening
Past perfect: I have written my book.
Why? --> You're describing this past event like it already happened.
Pluperfect: I had written my book when she presented me with her drawing.
Why? --> You're describing this past event as something that already happened before the other event.