Dave's ESL Cafe's Student Discussion Forums

[puzzle]

Dear teacher,
can you help me with this problem? It seems easy but when I study it carefully, I become puzzled.
I don�t know what time it was ______ I fell asleep last night？
A. that B. when C. before D. since
At first sight I choose A, but later I think If we choose A, it should be �at what time� not �what time�. But If we are asked to ask questions according the underlined part , how do we change this sentence �I fell asleep at six last night.� ? We will say �What time did I fall asleep last night?� Then emphasize �what time� we�ll have �what time was it that I fell asleep last night?� Then how about this sentence � It was six when I fell asleep last night?� How to ask questions according to the underlined part? So I don�t know whether to choose �A� or �B�.
Thank you!

[Eric Thompson]

Dear puzzle, To me, 'when' (B) is the right word to use in your sentence. 'When' is the conjunction to use in a dependent clause, relating to an independent clause that deals with time, concurrently. I hope you can understand those big words. But that's how I see it. Ok?-- Eric