They are all similar in meaning, but I think you probably want started (to do) his homework. #8 is much more natural than #7. #9 is more natural than #10.
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moon7296Are #1~10 interpreted in the same(similar) concept/thread?Yes, except that #1 doesn't seem to show such an immediate transition from one event to the next as the others do.
CalifJim#1 doesn't seem to show such an immediate transition from one event to the next as the others do.Ah, then #1 suggests that after he arrived at home, (and a few seconds or minutes later) he started to do homework?
Philip #5 to use 'instantly' it must go with the verb (as I suggested, he instantly started).You mean, #5 can be used, but should be rephrased?
moon7296CalifJim#1 doesn't seem to show such an immediate transition from one event to the next as the others do.Ah, then #1 suggests that after he arrived at home, (and a few seconds or minutes later) he started to do homework?Not really. All the others suggest that the homework started "immediately" after arriving home (allowing for time to take off a coat