`30.` It's impossible that Margaret could have carried such a heavy stone here. `->`A stone __________________________________________________ . `31.` If you don't return the bicycle immediately I'll tell your mother. `->`Either ____________________________________________________ .

`30.` It's impossible that Margaret could have carried such a heavy stone here.

`->` A stone here is so heavy that Margaret couldn't have carried. `(1)`

`->` A stone here is too heavy for Margaret to have carried. `(2)`

`-` S + be + so adj + that + clause.

`-` S1 + be + too adj + for S2 + to V-inf.

`- Trans: (1)` Một hòn đá ở đây nặng đến nỗi Margaret không thể mang nổi.

`- Trans: (2)` Một hòn đá ở đây quá nặng đối với Margaret để khiêng.

`31.` If you don't return the bicycle immediately I'll tell your mother.

`->` Either you return the bicycle immediately or I'll tell your mother.

`-` Either + S1 + V + or + S2 + V.

`- Trans:` Hoặc là bạn trả lại xe đạp ngay lập tức hoặc tôi sẽ nói với mẹ bạn.