5 seem are acting: To describe an action in progress (or an action which will occur in the immediate future), we use the present progressive (or present continuous tense). This tense is created using the appropriate form of the auxiliary 'be' plus the main verb (to act) in its 'ING' form: You ARE ACTING strangely.

Luna: I'm just curious. Take it easy, man. You seem are acting 5 really ''strangely''.

It's sound very strangely to me... I will have not make a mistake if you've not put stranglely, but stange! I know both are OK but we don't here that often.

Sébastien