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  1. It is => It's

  2. I am => I'm

  3. That is => That's

Why do we say "This is " instead of "This's"?

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How would you pronounce "This's" so it sounds different from "This is"? – Peter Shor Aug 17 '11 at 10:26
I come to this question not because of the indistinguishable in saying them, but because my spelling checker don't think this's is a word. – Ooker Jan 12 at 7:08
up vote 8 down vote accepted

After a sibilant, "'s" of possession is usually pronounced /ɪz/ ("the mouse's child", "the goose's wings", "the witch's hat".)

Generally, the possessive "'s" and the contraction of "is" or "has" are pronounced the same ("The cat's paw" vs "The cat's sitting outside"). So the likely pronunciation of "*The witch's waiting outside" would be pretty well indistinguishable from "The witch is waiting outside", so we treat it as the latter always.

The same applies to "this": "this's" would be indistinguishable from "this is" anyway.

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This sounds about right. I appreciated the menton of "has" being the same, because I have a few younger friends who occasionally (presumably) backform it: "The cat's been in the barn." to "The cat is been in the barn." Anyway, this also explains why other contractions with this are alright - i.e. this'll, and less commonly this'd. – tdhsmith Sep 3 '11 at 18:40

Some people do have an informal contraction this’s, with a much reduced or non-existent vowel in the second syllable, contrasting with a more formal this is with a full vowel in the second syllable. (I’m one of them.) The slight awkwardness of having two sibilants (in this case unvoiced [s] and voiced [z]) in succession probably explains why this contraction is less common than the others.

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