You should not laugh at others when they are in trouble改祈使句

You should not laugh at others when they are in trouble改祈使句
___ ____ ____ ___ when they are in trouble.
To plant more tress is important for us改同义句
___ __ for us ___ ___ ___ ___.
I don't know what yo say改祈使句
I don't know ___ ___ ___ say

Don't laugh at others
it's important to plant more trees
what could I
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