Question

I am living here since 1990(correct the sentence if necessary)​

Answer 1

I have been living here since 1990.

• The corrected sentence is in present perfect continuous tense.
• The corrected sentence means that I have been living here since 1990 and I'm still living here.
• While the given sentence in the question is an incorrect sentence beacuse present continuous tense has been used in it.
• When present perfect continuous tense is used it means that something that has already begun in the pas ia continuing in the present even.

Answer 2

I am living here since 1990(correct the sentence if necessary)

I have been living here since 1990.

The given tense is present continuous tense. we need to correct it to present perfect continuous tense.

Present perfect continuous tense describes an action that began in the past and continuing at present. It is also known as the present perfect progressive tense.

Structure of present perfect continuous tense:

Subject + has/have + been + 1st form of verb + ing + obj

Example: I have been waiting in the queue for 3 hours.

There are four present tenses:

1) Simple Present Tense: I go

2) Present Continuous Tense: I am going

3) Present Perfect Tense: I have gone.

4) Present Perfect Continuous Tense: I have been going