Yes, I heard him knock three times.
是的，我听到他敲了三下。
Yes, I did. I heard him knock three times.
是的，我听见他敲了三下。
I heard someone knock three times just now.
刚才我听见有人敲了三次门。
If you want to know a secret, knock three times.
如果你想知道一个秘密，敲三下门。
I heard someone knock (at the door) three times.
我听见有人敲过三次门。
I heard someone knock (at the door) three times.
我听见有人敲过三次门。
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