FCE 2 | U10: Modals expressing ability (ex. 2 & 4 - p. 112)

We walked all day, and at five o'clock we COULD / WERE ABLE TO reach the top of the mountain.

I was so worried that I COULDN'T SLEEP / COULDN'T HAVE SLEPT and I lay awake all night.

When I was a small child, I COULD / WAS ABLE TO sing beautifully, but my voice isn't so good now.

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