1. Look at the boy and his dog that are walking on the road.

2. This is the very fountain pen that I looked for.

3. Who that has common sense can say like that?

4. No people that are from Korea can have difficulty in speaking Korean.

(Are they all grammatically correct?)

3. Trouble with this one. Whoever has common sense can say it like that? I'm not exactly sure what you are trying to say in that one.

Sra