1. Once you start reading, you cannot stop it.
2. Once you go there, you will be satisfied with the scenery.
3. Once you paly soccer with them, you will like it.
4. Once you lern how to swim, you will like it.
5. Once you begin to learn the guitar, you spend more than 2 hours.
(Are the sentences all grammatical?)
1. Grammatical, but unlikely to occur. You cannot stop reading?
4. learn
5. "…spend more than 2 hours" doing what?