I’M SURE THE LETTER WON’T ARRIVE IN TIME UNLESS IT …(SEND)… BY AIR....
5. I’m sure the letter won’t arrive in time unless it …(send)… by air.
b-
1. saw / were singing / said / had been singing
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5. I’m sure the letter won’t arrive in time unless it …(send)… by air.
b-
1. saw / were singing / said / had been singing