Sentence examples similar to except when indispensable from inspiring English sources

Except when he is.

(Except when it's not.

Except when they don't.

Except when they are not.

Except when it's terrible.

Except when he didn't.

Except when it is not.

Except when the system works.

Except when it doesn't.

Except when it isn't.

(Except when it didn't).