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Dear teachers,

I made a few sentences below and need your advice.

Before I got to the computer lab, the class finished.

Before I got to the computer lab, the class had already finished.

When I got to the computer lab, the class finished.

When I got to the computer lab, the class had already finished.

After I got to the computer lab, the class finished.

After I had gone to the computer lab, the class finished.

Many thanks,

LCChang
1 2
Comments  
As they stand, only # 2 and # 4 are grammatical correct. # 5 and 6 sounded odd.

1 and 3 may be understood in conversation bu they are incorrect grammatically.

Before I got to the computer lab, the class had already finished.

When I got to the computer lab, the class had already finished
Anonymous1- Before I got to the computer lab, the class finished.

2- Before I got to the computer lab, the class had already finished.

3- When I got to the computer lab, the class finished.

4- When I got to the computer lab, the class had already finished.

5- After I got to the computer lab, the class finished.

6- After I had gone to the computer lab, the class finished.

The ones which have the same color mean the same thing. 3 means "First I got to the computer lab, then the class finished."
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Hi, Goodman,

Why do you think can "after" or "before" not be used with Simple Past + Simple Past?
GoodmanAs they stand, only # 2 and # 4 are grammatical correct. # 5 and 6 sounded odd.

1 and 3 may be understood in conversation bu they are incorrect grammatically.

Before I got to the computer lab, the class had already finished.

When I got to the computer lab, the class had already finished

<1 and 3 may be understood in conversation bu they are incorrect grammatically.>

??

Is "the class finished before I got to the computer lab" incorrect?
Diamondrg
Hi, Goodman,

Why do you think can "after" or "before" not be used with Simple Past + Simple Past?

? "It happened long before I was born."

"I put on my coat before I went out."
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They all look grammatically correct to me.

MrP
I should add that #3 implies: "on my arrival at the lab, the class finished" (i.e. the finishing happened at the same time as the arriving). So it's not a case of "before" or "after", if that's what your exercise involves.

MrP
MrPedanticThey all look grammatically correct to me.

MrP

I'd say the use of "before" does not always need the present perfect in such sentences. Would you say the same?

"The shop closed before I got there."

"The shop had closed before I got there."

Both uses are easily understood.
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