We may have been physically able to speak从生理上说我们那时就可以说话了

able to 能做 ...

You are better able to do it than I (am).

你比我更有能力做这件事。

I am able to pick you up on the short wave radio.

我能用短波收音机收听到你的信号。

it's more likely that the birth of language coincided with the proliferation of man-made objects around 50,000 years ago.语言的产生应该是在五万年前与人造工具广泛流传的时间相同

coincided with符合； 与 ... 一致

My free time does not coincide with his.

我和他不是同时有空。

Your views coincide with my own.

你的看法同我的看法不谋而合。

so these things seemed to appear rather abruptly,这些东西似乎是突然之间大量涌现

seem to似乎 ...

Peter and Susan seem to be cut out for each other.

彼得和苏珊似乎是天生的一对。

A pall of mystery seem to hang over it all.

整个事件似乎笼罩上一层神秘的气氛。