Today I want to clear up some confusion around the words sometime, sometimes, and some time. Are they all the same? No! These words have different meanings and uses.
Let’s start with sometimes. This is an adverb of frequency, meaning it describes how frequently something happens. Sometimes means it happens on certain occasions, but not always.
Sometimes I drive to school, and at other times I take the bus.
His English is pretty good, but he sometimes makes grammar mistakes.
When the weather is nice, we sometimes have a picnic by the river.
Sometimes is typically used with the simple present and simple past. It can be placed immediately before the main verb, or before the subject: Sometimes I drive to school / I sometimes drive to school. It can also be used at the end of the phrase: I drive to school sometimes.
Sometime (one word, without the S) is also an adverb, but it means “at an unspecified time in the future/past.”
We should go out for coffee sometime.
He’d like to talk to you sometime.
Let’s get together sometime soon.
I’ll call you sometime this afternoon.
She quit her job sometime last year.
Sometime is placed at the end of a phrase, as in the first two examples. When it is used like this, it means “in the future.” It can also be used in the structure sometime + a time period: sometime this week, sometime next year, sometime yesterday. When it is used with a time period (this afternoon, last year) then we can see from the sentence whether it is referring to an unspecified time in the future or past.
Now let’s look at “some time” (two words). This means “a period of time”:
Every evening I spend some time relaxing in the bath.
He did volunteer work for some time in college.
It will take some time to finish this project.
We don’t say how long the period of time is – it might be an hour, a couple of weeks, or a year. Some time can be used in the past, present, or future, as you can see from the three examples.
sometimes refers to frequency; it means on occasion but not always
sometime refers to an unspecified time in the past/future
some time refers to a time period