1He usually gives us classes (smilingly)（微笑）in class.
2Tom didn't stopping crying until he saw his mom.(改为同义句）
Tom stopped (crying immediately only when) he saw his mom.
3She put on a coat so that she wouldn't get cold.（改为同义句）
She put on a coat (so as) not to get cold.
4Neil is the fastest boy in our class.(改为同义句）
Neil is faster than (all of the other) boys in our class.
注：faster,fastest 只有一个 t .