Sure! Let's go through the functions and examples of "had better," "have to," and "used to" as modal auxiliary verbs:
1. Had Better
Function: "Had better" is used to give advice or suggestions. It implies that there may be negative consequences if the advice is not followed.
Examples:
- You had better finish your homework before you go out to play. (It’s advisable to finish your homework to avoid potential problems.)
- She had better see a doctor if her symptoms persist. (It’s recommended for her health.)
2. Have To
Function: "Have to" expresses necessity or obligation. It indicates that something is required or mandatory.
Examples:
- I have to attend the meeting at 9 AM. (It’s necessary for me to attend the meeting.)
- You have to follow the rules if you want to participate. (Following the rules is required for participation.)
3. Used To
Function: "Used to" describes a past habit or state that no longer exists. It indicates that something was true in the past but is not true now.
Examples:
- I used to play the piano when I was a child. (I played the piano regularly in the past, but I no longer do.)
- They used to live in that house before moving to the city. (They lived there in the past but don't anymore.)
Summary
- Had better: Suggests advice with possible consequences.
- Have to: Indicates necessity or obligation.
- Used to: Describes past habits or states that are no longer true.
These modal auxiliaries help convey different meanings related to advice, obligation, and past habits.