Can some one explain me when and where should i use this words
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rockstar25ch is correct3)you should not/cannot leave small objects lying around.
1)At what time should/shall I call you
2)Shall/can i come to your house tommorrow
rockstar25which is correct 1)At what time should/shall I call you?
2)Shall/Can I come to your house tommorrow?
Shall is used when you're asking a permission to do something and sounds quite official. They're all correct. Their usage depends on what you want to express.
rockstar253)You should not/ cannot leave small objects lying around."You cannot" sounds more imperative. "Should not" is more of advice.
please justify your answer