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1. The teacher __ already in the classroom before students came in.
a) had been
b) was

Which one is correct (a) (a )or (b)?
If both are correct, what's the difference (in meaning etc.)?



2. I __ already very hardworking. Still my mark is a bit worse than the best 5th student.
a) had been
b) was

Which one is correct (a) (a )or (b)?
If both are correct, what's the difference (in meaning etc.)?
And what is meant by "the best 5th student" / "the best 5 students"?
Is "the best 5 students" = "Top 5 students"?
Comments  
There is no call for the past perfect in either sentence, Wai Wai. It can't work anyway because the verb phrase should be 'had already been', not 'had been already'.

'The best 5th student' is not natural English to me, and might be rewritten to read 'the fifth-best student'. Alternatively, your suggestion, 'the best five/ five best students' would work fine.
So which is correct:
- was already
- had already been

If both are correct, will the difference in tense make the sentence different?
Students: We have free audio pronunciation exercises.
And moderator, I would like to know why the "edit post" button is not available for the first post.
If someone has posted a reply to your post, you will not be able to edit it.

If editing were allowed, the reply might not apply to the edited post! Emotion: smile
Ok.
Maybe you could allow post-ers to edit (as a side-note) at the bottom of original post.
And indicates the edit time when one edits a post.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Grammatically the past perfect is possible in these two sentences, but is natural in neither, because the time relation is clear without its use. If it is unclear which came first, or you want to stress that one past event came first, complete and independent of the second past event, past perfect is called for with both verbs. If the two actions are causally related, then use simple past for both of them.