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Are these sentences correct:

1-I was walking very carefully because the bridge could collapse.

2-I was walking very carefully because the bridge might collapse.

(... there was a chance that the bridge might collapse)


2-We were not worried because the bridge couldn't collapse.

(... it was impossible that the bridge should collapse.)


Gratefully,

Navi

Comments  
navitasanAre these sentences correct:1-I was walking very carefully because the bridge could collapse.2-I was walking very carefully because the bridge might collapse.(... there was a chance that the bridge might collapse)

I can't call them wrong, but they sort of are. The reason for the care with which you walked is only obliquely revealed, and it sounds like the writer doesn't realize that. You walked that way because you were afraid it might collapse. But I would not be surprised to hear either of your sentences from a native speaker of US English.

navitasan2-We were not worried because the bridge couldn't collapse.

The meaning is off. Any bridge can collapse. The engineers are always more surprised than anybody.