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A. These kinds of problem are to be avoided.

 

B. These kind of problems are to be avoided.

Are both A and B grammatical? If not, why not? If so, after having noticed the parallelism between A and C, and between B and D, could we say that C and D are "standard" English, too?

C. These kinds of problem are ones to avoid.

 

D. These kind of problems are ones to avoid.

A. These kinds of problem are to be avoided.

 

B. These kind of problems are to be avoided.

Are both A and B grammatical? If not, why not? If so, after having noticed the parallelism between A and C, and between B and D, could we say that C and D are "standard" English, too?

C. These kinds of problem are ones to avoid.

 

D. These kind of problems are ones to avoid.

A. These kinds of problem are to be avoided.

B. These kind of problems are to be avoided.

Are both A and B grammatical? If not, why not? If so, after having noticed the parallelism between A and C, and between B and D, could we say that C and D are "standard" English, too?

C. These kinds of problem are ones to avoid.

D. These kind of problems are ones to avoid.

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user114

Analysing the "kind(s) of problem(s) are [to[ones]/[to be]" construction

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user114
user114

Analysing the "kind(s) of problem(s) are [to be]" construction

A. These kinds of problem are to be avoided.

B. These kind of problems are to be avoided.

Are both A and B grammatical? If not, why not? If so, after having noticed the parallelism between A and C, and between B and D, could we say that C and D are "standard" English, too?

C. These kinds of problem are ones to avoid.

D. These kind of problems are ones to avoid.