Don't confuse the word "tense" with "time " .
Tense : indicates sense rather than time .The tense we use depends on the sense we wish to give our sentence . For example , the Present Simple can be used to indicate the future:
- He leaves to London next week .
In conditional sentences ,some of the tenses used have little connection with the time :
- If he left now ,he would arrive before nine .
So, you will avoid a lot of tense mistakes if you remember that the tense doesn't always indicate the time of the action .
I will post in this group many discussions about the tenses of the verbs as an answer to some learners 'questions.
I hope they can read and answer the exercises here :)