When they are necessary
"is' is present tense. For past tense use was or were.
you could use it in the future tense e.g i will be getting a hamster on saturday. for the past tense you would use been. for the present you could use something like doing
is - is present tense. He is from China. was - is past tense. He was sick last week.
I had is past tense. I have would be the present tense. And For he/she/it use has. He has a new car.
No. The word "are" is present or future tense. The past tense would be "were".
You should use present tense.
The past tense of "has" would be "had" or "have".Present tense is has or have. Past tense is had.he/ she/ it use has all other subjects use have.He has my book.I have his book.They have no books.
Past tense I had Present tense I have Future Tense I will have
"You are" is not a verb. "Are" is a verb, but it's present tense, and it can't be used "with past tense" because it's not past tense, it's present tense.
Have is present tense. The past tense is had.
Usage of Past Tense or Present Tense is all depends on the topic.
No 'is' is present tense. am/is/are = present tense was/were = past tense