June 8th homeworks and about this class

Phrase bank:checking understanding
a. ...didn't hear?
b. ...understood differently?
c. ...didn't understand?

What's the effect of using the words in brackets ()?
I think brakets () words is the word that the next word is emphasized.

1. Today I did textbook's questions and practiced conversation many situations.
2. Yes. Especially I enjoyed answering some questions about around the world.
3. Little difficult. Especially I didn't know what should I say when my partner says mistake things.
4. I learned some phrases. For example, what syould I say when my partner says mistake things.