英语中有哪些常见的插入语，特别是问句中的

英语中有哪些常见的插入语，特别是问句中的

do you think是常见的插入语。例句：
Who is singing？
Who do you think is singing？ 
What should I do first？
What do you think I should do first？

1.介词短语用作插入语 常作插入语的介词短语有：in fact(事实上)，in one’s opinion(在某人看来)，of course(当然)，above all /first of all (首先)，by the way (顺便)等。如：above all, you must follow your teacher’s advice. as a result, we must water the crop fields. in my opinion, he is an honest boy. 2.副词用作插入语 常作插入语的副词有：certainly(当然)，surely(无疑)，indeed(的确)，however(然而)，fortunately(幸运的是)，luckily(幸运的是)，probably(大概)，personally(就个人来讲)等。 如：unfortunately, i was caught in the rain. personally, i’d rather go to the opera theatre. surely, you must finish the task by di 3.不定式作插入语 常作插入语的不定式有：to be frank(坦率地说)，to tell(you )the truth(老实说)，to be sure(当然)等。 如：to tell you the truth, i didn’t want to go with you. 4.v-ing 分词短语作插入语 常作插入语的v-ing分词短语有：generally speaking(一般来讲)，generally considering(一般认为)，strictly speaking(严格地说)，judging from/by (根据……来判断)等。 如：judging from your accent , you must be from england. generally speaking, this is a rule for protection our school. 5.分句作插入语 常作插入语的分句有：i think(我认为)，i hope (我希望)，i’m aftaid(恐怕)，what’s more(而且)，what’s worse(更糟的是)，you see (你清楚)等。如：you see, they didn’t trust me . he will come on time, i think. (注意：这个句子如把插入语i think放在句首，它就成为主句，而后面的句子成为宾语从句成份，即：i think (that )he will come on time. 6. 常见的作插入语的形容词或其短语有 sure enough果然; worse still更糟糕的是; true真的，funny真可笑， strange to say说也奇怪， needless to say不用说， most important of all最为重要的是等，表现了说话人的情感或态度等。 1.strange to say (或true)，i was just thinking that myself.说也奇怪(或真的)，我自己刚才也正想着那件事呢。 2.most important of all， you each over fulfilled your own task.更为重要的，你们各自超额完成了自己的任务。 7. 过去分词短语作插入语 painted white, we like the house better. 漆成白色，我们更喜欢这房子。 注意：之所以称它为插入语，是由于这种过去分词是独立的，没有逻辑主语。 8. 用标点符号引导插入语 如：he was （strange as it seems）an excellent sportsman. 他（尽管还显得令人不解）是个出色的运动员。 he was －to me at least, if not to you－a figure that was worth having pity on.至少我觉得如此，即使你不这样认为，他是一个值得同情的人。