It seems like it's going to get hot today. 今天看起来会很热。

(1) hot 换为 cold
—> It seems like it's going to get cold today.今天看起来会很冷。

(2) 改为疑问句
—> Does it seem like it's going to get hot today? 今天看起来会很热吗？

(3) 把 get hot 改为 rain，再把 today 换成 soon
—> It seems like it's going to rain soon. 看起来很快会下雨。

I go up by the elevator. 我搭电梯上去。

(1) 主语改为 he
—> He goes up by the elevator. 他搭电梯上去。

(2) 改为否定句
—> I don't go up by the elevator. 我不搭电梯上去。

(3) 把第一句 he 为主语的句子前面加 I saw
—> I saw him go up by the elevator. 我看见他搭电梯上去。