我认为学体操很难。

　　还能这样说：

　　I think it difficult to learn gyms.

　　To me, it's not easy to learn gyms.

　　谚语：

　　A faithful friend is hard to find.

　　知音难觅。

　　2. I like to do calisthenics.

　　我喜欢做健美操。

　　还能这样说：

　　I am fond of aerobics.

　　Calisthenics is my favorite.

　　3. The first thing before I have my breakfast is to do exercises.

　　我吃早饭前的第一件事是做操。

　　还能这样说：

　　I do exercises before my breakfast.

　　I don't have my breakfast until I finish doing gyms.

　　谚语：

　　Cast not the first stone.

　　责人之前先自省。

　　4. Let's go and do exercises.

　　大家去做操吧。

　　还能这样说：

　　It's time to do gym.

　　What about doing exercises?

　　应用解析：

　　let sb./sth. be 不干涉，不打扰；

　　let go of 松开，释放；

　　let us say 比如；

　　to let 待租，出租