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Please send me messages whenever you are online.

Please send me messages whenever you online.

When will be online in this site?

When do you online in this site?

When do you online in this site usually?

When do you come online in this site usually?

Please correct my sentences.
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These are correct:

Please send me a message whenever you are on line.

When are you on line at/on this site usually?

When do you come on line at/on this site usually?
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you MisterMicawber

What is the opposite of "offline"? Is it "online" or "on line"?
I think that all the forms are in use, Gary: online, on-line, on line, offline, off-line, and off line. But I also think that the one-word forms and hyphenated forms should be used for attributive adjectives (coming before the noun) (an online/on-line dictionary) and the two-word form for a predicate adjective (He is on line now).