I must (dropped/have dropped/have been dropping) somewhere.
I have no idea here.
I was surprised that Kate wasn't at meeting yesterday. She (may not know/may not have knew/might not knew/might not have known).
I think "might not knew".
#1 I have lose my glasses.
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red train 520I must (dropped/have dropped/have been dropping) somewhere.
That is not a good sentence. "Drop" has an object. e.g. I dropped my keys somewhere.
red train 520I think "might not knew".
Incorrect. The modal verbs are always followed by the base ( dictionary ) form of the main verb.
"Knew" is the p