Answer:
The board is being written on by the teacher.
<u>Hope</u><u> </u><u>it</u><u> </u><u>helps</u><u> </u><u>you</u><u />
It's hot outside today.
It's is the contrasted form of it is and its is the possessive form *as it is without an apostrophe*.
For example:
The tree has lost all its leaves.
It's my birthday today.
