倒装句与强调句的结合
only when everyone knows how serious the danger of pollution is,will he do something to stop it.强调逗号前面的句子.
为：it is only when everyone knows how serious the danger of pollution is that he will do something to stop it.
而不是 it is only when everyone knows how serious the danger of pollution is that will he do something to stop it
是不是倒装句中如果only提前,则主句要倒装.可是如果改成强调不的话,only不放在句首了,所以后面不倒装?