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１．“was／were doing．．．when．．．”意为“正在……时突然……”。when后面可以跟suddenly。例如：I was walking in the street when（suddenly）I met an old friend of mine．我正在街上散步时，突然遇到了我的一个老朋友。２．“was／were about to do．．．when．．．”意为“正要……时，突然……”。例如：We were about to go out when the telephone rang．我们正要出去时，突然电话响了。３．“was／were on the point of doing．．．when．．．”意为“正要……时，突然……”。例如：I was on the point of going to bed when someone knocked at my door．我正要去睡觉时，突然有人敲门。４．“was／were on the way to．．．when．．．”意为“正要去……时，突然……”。例如：
1. “was/were doing...when...” means “suddenly when...”. When followed by suddenly. For example: I was walking in the street when(suddenly)I met an old friend of mine. When I was walking down the street, I suddenly met an old friend of mine. 2. “was/were about to do...when...” means “When you are about to... suddenly,...”. For example: We were about to go out when the telephone rang. When we were about to go out, suddenly the phone rang. 3. “was/were on the point of doing...when...” means “When you are about... suddenly,...”. For example: I was on the point of going to bed when someone knocked at my door. When I was going to bed, suddenly someone knocked on the door. 4. “was/were on the way to...when...” means “when you are going...when suddenly...”. E.g: