Is there any different between "train of thoughts"and "train of thought"？
Is there any different between "train of thoughts"and "train of thought"？
and...
Is there any different between "cooperative relationship"and "cooperative relations"？
Thank u first~

Question

Is there any different between "train of thoughts"and "train of thought"？
Is there any different between "train of thoughts"and "train of thought"？
and...
Is there any different between "cooperative relationship"and "cooperative relations"？
Thank u first~

Answer

It is better to say a train of thought =  the connections that link the various parts of an event or argument together; "I couldn't follow his train of thought".
 It is better to say a cooperative relationship= an involvement where people are working together willingly for a common purpose or benefit.

Answer

"train of thought" means 'something that a person is/was thinking about'.
We usually think about one thing at a time, so the word "thought" should be singular.

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