动词的现在进行时
现在进行时主要表示现在或现阶段正在进行的动作。可与now, at present, at this moment, these days等时间状语连用。
现在进行时的谓语形式：am / is / are +现在分词。
What are you doing, Jack?
We're trying to plan our future.
The train is now rapidly approaching the city.(approach 接近)
Life is changing all the time.
The woman who is standing here is my mother.
动词go, come, leave, stay, arrive, die 等用于进行时态中，可以表示将要进行的动作。
The bus is leaving, please hurry up.
It's going to rain. Don't forget to take the umbrella.
My uncle is coming to see us this weekend.
The boy is leaving for Beijing tomorrow.(leave for 动身)
1. Health experts in many countries still ________ their ideas about the relationships between our food and our health.
A. have tested B. tested C. are testing D. test
still(仍旧)一般用于进行时。
still一般放在系动词后面，实义动词前面。
答案 C
2. What is this noise? Tell me what _______ here.
A. went on B. goes on C. is going on D. will go on
答案 C
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