PLS HELP!
is "sure" a subordinating conjunction?

No

Explanation:

common subordinating conjunctions: after, although, as, because, before, how, if, once, since, than, that, though, till, until, when, where, whether, while.

I would say no

Explanation:

A subordinating conjunction joins a subordinate clause to a main (independent) clause.

Yes

Explanation:

Open a Web browser and go to Google Classroom  You have to sign in with your Google Apps for Education account.

On the Welcome screen, click the plus sign at the top and choose Create Class.

In the Create a Class dialogue box, type in the Class Name and Section.

Click Create.