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Here are two examples of elliptical sentences whose missing words are understood by convention. English speakers normally use the shorter forms.
* "Fire when ready" means "Fire when <u>you are</u> ready."
* "Back to the drawing board" means "<u>We need to go</u> back to the drawing board."
Here are three examples of elliptical sentences whose missing words were already used in a previous phrase.
* "I drank water, and Bob milk" means "I drank water, and Bob <u>drank</u> milk.
* "I drank water, not milk" means "I drank water; <u>I did</u> not <u>drink</u> milk.
* "I drank water, and Tom did, too" means "I drank water, and Tom <u>drank water</u>, too."