When was crossing the road I saw lam who was cross the road I helped him
Answers
Explanation:
The difference between sentences 1 and 2 is very subtle. If you say see someone do something, then you saw the entire action, form beginning to end. If you see them doing something, then you caught them in the middle of it.
For example, "I saw the baby crawl from the sofa to the table". - you saw the whole thing. On the other hand, "I saw the baby crawling in the bedroom." - you saw the baby at some point while it was crawling, maybe you entered the bedroom and it was right there, on the floor, crawling.
On the other hand, sentences like "I saw the baby smile" and "I saw the baby smiling" would not be so clearly defined.
As a general rule (do not forget, this is English and it does not always apply), if you use the infinitive, you see the complete action; if you use the -ing form, you see part of it, you see it in progress.
Sentence 3 is incorrect in my opinion. As for sentence 4, after while it is a good idea to say who because the way it is written now it could mean either "I saw him while I was crossing the road", or "I saw him while he was crossing the road
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