Use Present Perfect or Present Perfect Continuous:
1. Mary says she (forget) to buy some meat for dinner and asks me to do it, but I can’t. I am doing my homework, I (to do) it for two hours already and I (not, finish) all the exercises yet.
2. How long you (know) Mrs. Hurrison? – I (know) her for ages but I (not, see) her lately.
3. We (not, meet) the Johns for a long time. Is everything all right with them? - Yes, it is. I just (to speak) Mr. John on the phone.
4. Mark (learn) to drive a car for half a year already. But I don’t think he (become) a real driver.
5. Helen (dream) about going to Spain since last summer. I think she already (book) plane tickets for her trip.
6. I am afraid of Moscow roads. I always (be) afraid of them.