1. He logged on to check his e-mail.
2. He logged in to check his e-mail.
3. He logged on to check his e-mails.
4. He logged in to check his e-mails.
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Which ones are grammatical? Can we use all of them?
2. He logged in to check his e-mail.
3. He logged on to check his e-mails.
4. He logged in to check his e-mails.
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Which ones are grammatical? Can we use all of them?