1. To give a reason or explanation: This is the most common use of "for." It introduces a clause that explains why something is the case or why someone does something.
* Example: "I went to the store for milk." (The reason I went to the store was to get milk.)
2. To indicate purpose or intention: "For" can also be used to show what something is intended for or designed to do.
* Example: "This is a chair for sitting." (This chair's purpose is to be sat on.)
3. To express duration or time: "For" can be used to indicate a period of time.
* Example: "I've been living in this city for five years." (I have lived here for a period of five years.)
4. To introduce a recipient of something: "For" can indicate who something is given to or intended for.
* Example: "This gift is for you." (The gift is meant to be given to you.)
5. To indicate preference or choice: "For" can be used to express a preference for something.
* Example: "I prefer coffee for breakfast." (I like coffee more than other breakfast options.)
6. In some cases, "for" can be used as a preposition and can mean "in exchange for" or "in return for".
* Example: "I sold my car for $5000." (I received $5000 in exchange for my car.)
It's important to note that "for" is often interchangeable with other conjunctions like "because" or "since" when expressing a reason. The choice of conjunction depends on the specific context and desired nuance.