4.-Can you help kids with (swimming,swim),Mike?

-Yes,I can.

3.Tom can play the guitar very(good,well).

2.I want (to join,join)the music club.

1.-Can you sing in English,Tommy?

-Sorry，I (can,can’t).

7.well　表示“敲、打得好”，要用副词。因为副词可修饰动词。

6.kids　kid为可数名词。根据生活实际，要用复数。

5.swimming　swimming club为“游泳俱乐部”，为习惯用法。

4.musician　通过句意“她想成为音乐家”，句中要用名词musician。

3.sing　句中出现了情态动词can，后边的动词要用动词原形。

2.to join　want to do sth.是固定用法。