Sometimes, sometime, and some time are very different words so you need to be careful when you use them. These are words that even native speakers get confused with!
Sometimes is an adverb of frequency. Use sometimes to talk about how often you do something. Think of it as halfway between never and always.
Sometimes I am so tired I can’t get out of bed!
He sometimes plays tennis instead of going to the gym.
We like to go to the beach on vacation sometimes.
Learn more: English Grammar: Adverbs of frequency
Sometime (no s) is also an adverb. Use it to talk about an unspecified point in the future or an unspecified point in the past.
We should get together for coffee sometime!
Sometime soon I would like you to clean your room!
The accident occurred sometime before 6pm.
Sometime (no s) is also an adjective in American English, but it is rarely used. You will probably never need to use it in conversation, but you may hear it. Use it to talk about what someone does or is sometimes.
She’s a sometime babysitter.
(Sometimes she babysits. She doesn’t do it all the time. She babysits once in a while.)
Winning is not a sometime thing; it’s an all the time thing.
(This is a famous quote from an American football player and coach Vince Lombardi. It means that winning is something that you do sometimes. It’s something that you do all the time!)
Some is used to talk about how much of the noun time you have or want. It’s like saying some food or some people:
Do you have some time to check my essay?
She loves to spend some time in her garden.
Give me some time to think about it.
Some time is also used in a couple phrases.
The phrase for some time now means for a long period of time, not something that you just started recently.
We’ve been thinking about buying a house for some time now.
He has wanted a new car for some time.
The phrase in some time means in a long time.
I haven’t seen or heard from her in some time! What is she doing now?