Verb to be

The Greek sea god, Proteus, was (like the sea) capable of changing form in an instant. In order to get any decent information out of him, you had to grab him and hold on tight while he went through his various forms — lion, wild boar, snake, tree, running stream — it wasn't easy. The verb “To be” is said to be the most protean of the English language, constantly changing form, sometimes without much of a discernible pattern. Considering that we use it so often, it is really too bad that the verb “To be” has to be the most irregular, slippery verb in the language.

We must choose carefully among these various forms when selecting the proper verb to go with our subject. Singular subjects require singular verbs; plural subjects require plural verbs. That's usually an easy matter. We wouldn't write “The troops was moving to the border.” But some sentences require closer attention. Do we write “The majority of students is (or are) voting against the referendum"? Review carefully the material in our section on Subject-Verb Agreement, and notice how often the choices we make require a familiarity with these forms of the “To be” verb.

We create simple yes/no questions by inverting the order of subject and the “To be” verb.

Is your brother taller than you?
Am I bothering you?
Were they embarrassed by the comedian?
The same inversion takes place when “To be” is combined with verbs in the progressive:
Am I working with you today?
Is it snowing in the mountains?
Were your children driving home this weekend?