i'll tell them.don't make buses with such small seat.合并成一句i'll tell them( )( )make buses with such small seat.

i'll tell them.don't make buses with such small seat.合并成一句i'll tell them( )( )make buses with such small seat.
i'll tell them.don't make buses with such small seat.合并成一句
i'll tell them( )( )make buses with such small seat.

i'll tell them.don't make buses with such small seat.合并成一句i'll tell them( )( )make buses with such small seat.
同学,
i'll tell them( not )( to )make buses with such small seat.
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答案 not to
固定用法：tell sb not to do sth 叫某人不要做某事。