Rewrite these sentences

Rewrite these sentences, using adjective baclauses :
Learning Chinese is difficult for me.
Making friends is not easy.
He thinks seeing a detective movie is interesting.
Helping other people is necessary.
Writing that letter is easy for her.
Meeting him at busy time of the day is difficult.
To meet you again after my holiday is very pleasant.
To do all of these exercises in an hour is impossible.
To swim in the sea in the summer morning is exciting.