2. carol and i are old friends. we (to know) each other since we (to be)in primary school. 3. as soon as i (to get)home tonight i (to give) you a call.

Here are the correct verb forms for your sentences, along with a brief explanation of the grammar rules applied. 2. Carol and I are old friends.

Correct Sentence: We have known each other since we were in primary school.

• have known: We use the Present Perfect here because the action (knowing each other) started in the past and continues into the present. Since "know" is a stative verb, we do not use the continuous form.
• were: We use the Past Simple after "since" to indicate the specific point in time when the state began.

3. As soon as I get home tonight...

Correct Sentence: As soon as I get home tonight, I will give you a call.

• get: In English, we use the Present Simple in time clauses (sentences starting with as soon as, when, after, until) even when referring to the future.
• will give: We use the Future Simple in the main clause to express a promise or a future intention.

Would you like me to provide more examples of time clauses or state verbs to help you practice these rules?