witnessed 时态

Between 2000 and 2005, these years have witnessed a growing socialmobility.

此处是主语补足语吗

Students have becom konwledgeable.书上说此处的knowledgeable"是做主语补足语，即做主语students的补语，那这样理解的话不就是助动词have+系动词become了吗？但是前面have become不是现在完成时吗?望指教如题

sunlight 搭配什么介词

The exposure _____ the sunlight is bad to your skin.

定语从句或各种从句的疑问

定语从句中的动词疑问，及物动词和不及物动词用法。This is the room where i once lived.这是我在百度百科看到的例句，他说这里的live是不及物动词，不是后面一定要加个in吗？This is the room where i once lived...

confused 还是 confusing

I was so ______ in todays history lesson. I didnt understand a thing. A, confused B. neglected C. amused D. amazed请问：这四个选项都是什么意思，不好选啊！为什么都是过去分词呢？我想选A，可是为什么不...

is做系动词还是助动词

Her dream is to be a teacher. 由于be to do也表示将来，所以这里的is如何理解？构成将来时的助动词还是仅仅为系动词？

这是否定转移吗（I dont work normal hours every day）

I dont work normal hours every day. My hours and days are different every week.

enjoy可以用于进行时态吗

It’s good to have a different focus. People have been bringing theirchildren in to see the hens and residents come and sit outside to watch them.I’m enjoying the creative activities,and it feels great...

imagine have... 的have是作什么作用?

Imagine have the police intercept your plans to rob a bank.请问,这个句子中多出来的have是做什么用的? 如题

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.