Когда используется does а когда do?

ride - are riding

write - am writing

have - are having

run - is running

swim - am swimming

watch- is watching

1)my close friend lives in moscow now

2) as a rule, he spends his holiday at the seaside.

3) i am very busy on sunday.

4) she is always very glad to see me.

5) there is nothing to think about.