I feel am not good with using that's and it's in a sentence. Can anyone please help me, when to use the former one and when the latter?

For example, what will come here, that's the least I could do for you or it's the least I could do for you.

I just don't understand the difference.

Are these two different in british and american english?

  • "Thank you for [your help]." - "Don't mention it, it was the least I could do." It refers to the service just mentioned. That just gives more emphasis - "That was something your sister should have done for you." Mar 17, 2020 at 14:51

1 Answer 1


That's and it's are contractions of that is and it is.

You are able to tell yourself which sounds best if you expand them as such. One will flow while the other may make a clanking sound.

Either may be used in most cases with little difference. The purist may say that the that refers objectively to that which has been done, as a thing or object. Using it will be more in hand in the present.

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