Which one is correct???
1. don't tease him,he has been working since morning..
2. don't tease him,he kept on working since morning..
please let me know..

Question

Answer

1. Don't tease him - he has been working since morning.
This is correct.

2. Don't tease him - he has kept on working since morning. 
You need 'has' to make it work.  This form is correct, but it is awkward.  You would normally not hear it.

Answer

Correction: 1. Don't tease him, he has been working since this morning.

2. Don't tease him, he's  been working since this morning..

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