insist和suggest是常见的动词，它们各自在词义及用法上具有双重性，弄不好会出错误。

一、insist

A）作“坚决认为”解释时，其后面的宾语从句用陈述语气。如：
I insisted to everyone that he was wrong．我对每个人坚持说他错了。
The Arab insisted that he had never seen the camel．
这阿拉伯人坚持说他从没看见过这头骆驼。

B）作“坚决主张、坚决要求”解释时，其后面的宾语从句要用虚拟语气，即宾语从句的谓语用（should）do sth．如：
I insisted that he（should）go to see my father．我坚决要他去见我的父亲。
The Arab insisted that they（should）look for the camel．
这阿拉伯人坚持要他们去寻找这头骆驼。
同时，我们也可以用insist on sth．或insist on doing sth．来表达上述的两种意思。如：
I insisted on my correctness．（＝I insisted that I was correct．）我坚持认为自己是对的。
He insists on his innocence．（＝He insists that he is innocent．）他坚持认为自己无罪。
We all insist on not resting until we finish the work．（＝We all insist that we〈should〉not rest until we finish the work．）我们都坚决要求不完工就不休息。
He insists on my being present at the meeting．（＝He insists that I〈should〉be present at the meeting．）他一定要我出席这个会议。

二、suggest

A）作“使想起、暗示、表明”解释时，其后面的宾语从句用陈述语气。如：
Her expression suggested that she was angry．她的表情显示出她生气了。
Are you suggesting that he is too old for the job？
你的意思是说他年纪太大了而不能干这工作？
B）作“建议”解释时，其后面的宾语从句用虚拟语气，也就是说宾语从句的谓语用（should）do sth． 如：
I suggested that she（should）leave early for the airport．
我建议她早点儿动身去机场。
He suggested that I（should）wear a jacket．他建议我穿一件夹克衫。
我们也可以用suggest（one / one's） doing sth．来表达“建议”。如：
I suggested our class holding a meeting to discuss the problem．（＝I suggested that our class（should）hold a meeting to discuss the problem．）
我建议我们班开个班会讨论这个问题。
He suggested putting off the sports meet to the next week．（＝He suggested that the sports meet（should）be put off to the next week．） 他建议运动会推迟到下周。