Used to vs. Use to?

I used to play the piano

I didn't use to play the piano

'used' in a positive sentence

'didn't use' in a negative one

In both cases you are referring to a past habit. If you want to refer to a present habit, use simple present:

I play the piano (often / regularly /a lot, etc.)

Personally, I'd pick the Civic if the CONDITION of the vehicles were the same. Even 10 years old, the Honda should have the edge on durability and have fewer repair issues. Durability however is greatly affected by prior owner care history. Also, at this age, you'll likely be doing some repairs using junk yard parts, there are many more Civic's in the world, so parts will be more available. Astrobuf

I used to play the piano

First one means I played the piano regularly in the past.

Second one could be part of a sentence, I guess: These are the hands I use to play the piano.

The second sentence is grammatically incorrect.The word 'Used' can be used only as a link to past continuous action.On the otherhand the word 'use' shows usage of materials like in the sentence"I use soap when taking bath".So in the sentences under discussion you can say"I use the piano for playing.But you have to say"I used to play the piano"as action is past.Hope I have explained it correctly.

Lots of people get this wrong.

If we say something used to happen we are talking about repeated events and actions in the past, usually things that happened a long time ago and are now finished. To express this we can use either used to or would.

"When I was young I used to play with my toys."

"When I was young I would play with my toys.

If you want to talk about repeated states or habits in the past, you must use used to, you cannot use would:

"I used to play the piano."

The question form is ‘Did you use to…?'. When asking a closed question you put did/didn't in front of the subject followed by use to, you cannot use would.

"Did you use to play the piano?"

If something used to be done,like your playing the piano,it means that it was done regularly in the past.

To say that I use to play piano will be incorrect usage.You can say 'I use my fingers to play piano.'

Your intent is to tell the reader WHEN you played the piano. "Used to" is a prepositional phrase linking the subject ("I") and the verb ("play") and defining when the action took place (in the past).

The word "use," is a present-tense verb, so it cannot represent something that happened in the past. Therefore, the word "use" in this statement can only make sense when followed by a noun (i.e., "my fingers"), linking it to the action "play."

I used to play the piano - past tense

I use [my hands] to play the piano - how you play it

In your case the expression would be "used to". However: "A bat what you use to hit the ball in baseball.".