1. Preposition:
* To indicate a purpose or reason:
* "I went to the store for milk."
* "He studied hard for the exam."
* To indicate duration:
* "I waited for an hour."
* "She worked for five years."
* To indicate direction:
* "I looked for the key."
* "She ran for the bus."
* To indicate an exchange or substitution:
* "They traded their car for a new one."
* "He exchanged his old phone for a new one."
2. Conjunction:
* To indicate a reason:
* "He stayed home for he was sick."
* To indicate a purpose:
* "We went to the park for we wanted to play."
3. Part of a prepositional phrase:
* "for example"
* "I love all kinds of fruit, for example, apples, oranges, and grapes."
* "for instance"
* "There are many ways to get to the airport, for instance, by taxi or by bus."
* "for sure"
* "I'll be there for sure."
4. To introduce a noun clause:
* "for what"
* "I don't know for what she's waiting."
* "for why"
* "He didn't explain for why he was late."
5. In phrasal verbs:
* "look for"
* "I'm looking for my keys."
* "wait for"
* "We're waiting for the train."
* "care for"
* "Would you care for some tea?"
It's important to note that the meaning of "for" can change depending on the context. Always pay attention to the surrounding words and phrases to understand its intended meaning.