Match Wits With Our Word Wizards

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To Use Its or It's--
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The construction of figure 1 is approximate because (its, it's, its') purpose is to identify activities, not to classify efforts precisely.
Here (its, it's, its') important to consider (its, it's, its') marginal cost.
Essentially, the crew had to choose between allowing the aircraft to be governed by (its, it's, its') automatic pilot or to fly it manually.
A representative of the design group was assigned to define the input and output requirements for the support program and verify (its, it's, its') operation.
The helix slow-wave circuit remains the mainstay of the traveling-wave tube (TWT) industry because (its, it's, its') stable.
The dynamics of a charged particle in electromagnetic fields are completely determined by (its, it's, its') specific charge to mass ratio q/m.
The radial component of magnetic flux density is often neglected but (its, it's, its') significant relative to the longitudinal component.

For an explanation of its, it's, and its', see Quirks of English.

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Last updated: 1/20/2009