Modal auxiliaries: indicate potential or uncertain.  

Will/would(used to), can/could, may/might, shall/should, must(have to/had to)

In parenthesis() are semi modals/same as meanings but not grammatically same.

Conditional sentences:

The real-factual and habitual and the unreal-contrary to fact or hypothetical.

If I have the time, I will go. (I will go unless I don’t have time)

I will play tennis unless I have a headache. (if my headache disappears, we can play tennis)

If I had time, I would go.

(I cannot go, this is contrary to fact)

We could go out tonight if we dint have to study.

(both sentences mean: we cant go out tonight because we have to study.)

Can never be “was”. Always “were” in correct English(In conditional.)

In unreal conditional sentences, if sentence is negative, meaning=positive. If sentence positive, meaning= negative. If I  were reach, I would travel around the world.( I am not reach so I am  not going to travel around the world)

If I hadn’t  been in a hurry, I wouldn’t have spilled the milk.( I was in a hurry. I spilled the milk)

Past perfect is followed by modal + perfect+pp.

Real conditions (possibly true)

Future: if I have the money, I will buy a new car.

Habitual: john usually walks to school if he has enough time.(no modal)

Command; if you go to the post office, please mail this letter for me.(simple form of verb)

Unreal conditions (untrue)
If I had……., I would……….

If I were……..,I would……

If he dint…….., you could……..

Past: if we had known that you were there, we would have written you a letter.

Or, Had We known that you were there, we would have written you a letter.

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