That'd is a spoken form of 'that would,' or of 'that had' when 'had' is an auxiliary verb.

Is funner a grammatically correct word?

Definition: More (or Most) Amusing or Enjoyable

I am sad that "funner" and "funnest" are not proper words. ... We may often use fun as an adjective today ('I had a fun time'), but when the word first entered the English language at the end of the 17th century it was mostly used as a verb or a noun.

Is acrobatics singular or plural?

Hint: Acrobatics can be used either as a singular or a plural in writing. Acrobatics is taught at clown school. The acrobatics were amazing.