Learn to use three question words with the verb ‘to be’ – ‘what’, ‘who’ and ‘how (much/old)’.
Learn to use the past of to be in English in this grammar video.
Learn how to ask simple yes and no questions using to be in English when you watch this video.
Learn to ask and answer questions using to be in the past.
This video goes over the negative forms of to be in Present Simple. It also reviews how to make regular and irregular plural nouns.