doesn
v.v. the short way to write 'does not'. You use it to make a negative sentence when talking about one person or thing.
v. the contracted form of 'does not'. Used with third-person singular subjects to form negative statements or questions in the present simple tense.
He doesn't like coffee.
The new software doesn't work on older computers, so we need to upgrade our hardware.
Although the theory seems sound in a laboratory setting, it doesn't necessarily translate to real-world applications where environmental variables are harder to control.
Used with third-person singular subjects (he, she, it, or a singular noun). Followed by the base form of the main verb without 's'.
He doesn't likes apples.He doesn't like apples.After 'doesn't', the main verb must be in its base form without an 's'.