that'd
pron.pron. a short way of saying 'that would' or 'that had'. You use it when speaking or writing to friends to make your sentences flow more quickly.
pron. a contraction of the demonstrative pronoun 'that' and the auxiliary verbs 'would' or 'had'. Primarily used in spoken English or informal written registers to represent natural speech patterns.
If we left now, that'd be great.
I thought about calling him, but I realized that'd only make the situation more awkward than it already was.
While formal essays require full forms, in a casual email to a colleague, writing 'that'd be helpful' is perfectly acceptable and sounds much more natural than the full construction.
The apostrophe replaces the missing letters 'woul' or 'ha'; the specific auxiliary is determined by the following verb form.
that'd been betterthat'd have been betterWhen 'that'd' represents 'that would', it must be followed by 'have' to form the conditional perfect; 'that'd been' is often a mishearing of 'that'd have been'.