Today, I have started the LinkedIn account and sending a connection request with an introduction message to the leads(Prospects).
Is this correct?
Your sentence should read: Today I created a LinkedIn account and sent connection requests with an introductory message to the leads(Prospects) Well done on your efforts!
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Your sentence should read:
Today I created a LinkedIn account and sent connection requests with an introductory message to the leads(Prospects)
Well done on your efforts!
If you are reporting something that you have done in the past, then you should use "I have started a LinkedIn account and sent connection requests..."
If you are reporting something that you are currently doing, then you should use "I have started a LinkedIn account and am sending connection requests..."