Make sentences in present perfect. 1. she (to buy) a new car? 2. i (to give up) smoking. 3. my father (not to start) a new job. 4. i (to write) a letter but i (not post) it yet.

1.Has she bought a new car?
2.I have given up smoking.
3.My father hasn't started a new job.
4. I have written a letter but I haven't posted it yet.