a series of waves作主语谓语动词用单数还是复数

take turns后接不定式还是现在分词

牛津高中英语模三p9有这样一句话：The other group members could take turns narrating and holding the pictures. 另外一组的成员可以轮流叙述和举画。句中的take turns后面接的是现在分词，但我的笔记上有take tu...

phonetic system什么意思

这里的phonetic system什么意思？音系？written script什么意思？如何理解？如何怎么翻译了？

of-短语作定语时的修饰对象判断

You’ll need several pieces of string of different lengths.of different lengths修饰string 还是pieces of string？如题

新概念3-10： to abandon ship 同位语还是后置定语

The order to abandon ship was given and hundreds of people plunged into the icy water.

More than 50 years可以用作主语吗

More than 50 years has passed since the end of the Second World War,but this is the greatest disaster in human history.

many times 是时间做状语成分吗

You see them many times decorated with red envelopes and messages of good fortune.

especially 前面为什么没有连词

I love all my friends, especially you. 请问，especially是副词强调you. 但是 为什么句子没有连词呢？ 还是说这是进行了省略 如 I like all my friends, and especially I like you.辛苦解释一下。如题

on?discussion与under?discussion的区别

on discussion 和 under discussion 都可表示“在讨论中”，都是固定搭配（都用介词on且都不用冠词）。请问它们有区别吗？如题

It was three years since we had been there 怎么理解

您好!

定语从句中什么情况下不能将介词置于句末

语法书上讲到：

句中两个with短语做什么成分

With the mass production of pencils, they are getting drastically more popular in many countries with each passing decade.句中的with the mass production of pencils 是看做原因状语吗 ?句中的with each pa...

虚拟语气判断

好。我看到这样一个句子，We had hoped to give you a chance such as nobody else ever had. 怎么翻译是，我们本来希望给你一个别人从未有过的机会。所以，这句话是虚拟语气吗？如题

make sure后接从句时要用一般现在时表将来吗？

make sure后接从句时要用一般现在时表将来吗？还是可以用一般将来时表示将来？如题

there be中的be是系动词吗

我知道 there be 句式也叫存在句。请问这里的 be 是系动词吗？

关于happen的疑惑

What happened to her？在该句中，为什么没有助动词？网上有种说法是happen为不及物动词所以不用助动词，这种说法成立吗？还是因为what本身做某种主语，所以不需要助动词？