Hi Ann. Most of what you have written is correct but I would point out the following:-

currently= now, at present.

For example: I am currently at work.


register --- It's a verb.

For example: It's easier to speak with friends from other countries if I register on skype. 
 
register --- can also be a noun:

For example: After taking their marriage vows, they signed the marriage register.

For example: A sentences always has commas and period. In English we refer to period as a full stop


composed of = comprise

For example: The committee is mostly composed of teachers and students.

You can also say:  The committee is comprised mainly/mostly  of teachers and students