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The correct answer is "Could then".
you could have completed the CA course
Could be but it could also be just form the sex Could be but it could also be just from the sex
"Could you send me a letter." Good."Could you please not send me to Coventry." Good.
"Could you send the money to me." Good.
"Could you send me money." Good
"Could you send to me money." Not so good, but perfectly understandable.
could isn't a verb, coz you can't 'could' something. you can't 'could'. a verb is a doing word..like you can run, jump, write..but you can't could