1. I arrived there at two quarters past three.
2. I arrived there at half past three.
3. I arrived there at three thirty.
4. I arrived there at three-thirty.
[Which expressions can we use? Do we need to use "-" as in #4?]
2. I arrived there at half past three.
3. I arrived there at three thirty.
4. I arrived there at three-thirty.
[Which expressions can we use? Do we need to use "-" as in #4?]