Conditionals & sequence of tenses

Формулы основных типов условных предложений
Zero Type – laws of nature, rules
If + Present Simple, Present Simple
If I ask him, he always helps me.
When you heat water at 100C, it boils.
First Type – real condition for the present or future/plan/real dream
If + Present Simple, Future Simple(will+V1)
If he needs (понадобится) your help, he will ask for.
When I come/she comes home(вернусь домой), I will call you.

Формулы основных типов условных предложений
Second Type unreal condition/dream/wish/imagination /advice «бы»
If + Past Simple, Future-in–the-Past(would+V1)
If we worked together, we would know each other better.
If the lockdown was over soon, we would fly to Spain.
If I lived in the country, I would walk outside.
If I were/was you, I would not lie in the sun so long.
Third Type unreal condition for the past/regret
If + Past Perfect, Future Perfect-in-the-Past(would+have+V3)
If they had asked me, I would have told them not to do it.
If I hadn’t forgotten to buy some milk, she wouldn’t have sent me for it again.

Wishes
Вот бы - I wish I + Past Simple/Past Progressive
I wish I had a new car.
I wish I got a Red Diploma.
I wish I were/was a princess.
Если бы только - If only + Past Simple/Past Progressive
If only they went away.
If only I could play the violin.
I wish/If only + Past Perfect/Past perfect Progressive
If only he hadn’t broken his leg so heavily.
If only he had written the control check in time.

Conditionals: 3 main types
What would you do if he spoke (speak) to your parents?
If I were you, I would have (have) some snacks.
If she had realised it earlier, she would not have got (not/get) into so many troubles those days.
They will believe you if you tell (tell) them the whole truth.
We will call (call) you if we have any problems.
If I’d started learning English a year earlier, I would not have had (not/have) bad marks last semester.
I wish I were/was (be) a university student.

Translate
Если принесут письмо, сразу позвони мне.
Если она купит себе новый ноутбук, она отдаст мне свой старый.
На Вашем месте я бы подумал о будущем своих детей и копил деньги на учебу.
Если бы ты тогда не поссорился с ней, она бы не уехала в Москву.
Если бы я тогда не сломал руку, я бы мог поступить в консерваторию.
Я бы собрал всех своих друзей в Москве, если бы знал, что они там.

We should also remember the if-part of the sentence don’t necessarily must start with “if”.
We can also use “when” or “unless”
In case, after, provided, until, as soon as
Unless means “if not”.

If or when
We can’t go for a walk _when__ the rain stops.
__If _ it snows a lot, we won’t go to school.
_If__ it rains till tomorrow, the town will be flooded.
_If__ he is disqualified, he can’t enter the contest.

If если or unless до тех пор, пока не
I will not go to the park if/unless the weather is fine.
He won’t wake up if/unless you set the alarm clock.
We will stay at home if/unless it rains.
I’ll be upset if/unless my friend doesn’t win.
If/Unless she doesn’t study, she will fail her exam.
If/Unless she studies, she will fail.