Question

Is it I ( used ) or ( use ) to be so generous

Answer 1

Used

Step-by-step explanation:

Used to refer to something familiar or routine, as in "I'm used to getting up early for work," or to say that something repeatedly happened in the past like "we used to go out more." Use to typically occur with did; "did you use to work there?" or "it didn't use to be like that," describing something in the past that doesn't happen anymore.

Answer 2

I used to be so generous.

Step-by-step explanation:

This can be confusing because of the pronunciation for native English speakers is very similar, however there is a correct answer.

The correct answer is almost always used, as in your example here, however in negatives and questions it is use. For example, the sentence "It didn't use to be this way," is correct compared to "It didn't used to be this way."

Hope this helps, feel free to comment with questions.