wasnt

Example:He wasn't there when the accident happened.

Definition:contraction of 'was not'

Example:She studied all night, but she wasn't prepared and still failed the exam.

Definition:used to emphasize what did not happen before a negative result

Example:He wasn't well, but he insisted on coming to the meeting instead of his assistant.

Definition:used to contrast what did not happen with what actually did happen

Example:You weren't feeling well, or you wouldn't have skipped the meeting, right?

Definition:used to offer an alternative when what was expected did not happen