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The government is sending a team of agronomists to remote areas to look into cooperative farming techniques that the peasants claim have greatly improved their crop yields.

I think the word "to" is missing in the sentence above.

The government is sending a team of agronomists to remote areas to look into cooperative farming techniques that the peasants claim to have greatly improved their crop yields.

Am I correct? Please advise.
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I don't think you need "to" here. The second part of the sentence means:  ".... the peasants claim that the cooperative farming techniques have greatly improved their crop yields." 
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Thanks for the explanation. However, I still would like to say what I think of this sentence. Here is my two cents:

The government is sending a team of agronomists to remote areas to look into cooperative farming techniques that the peasants claim have greatly improved their crop yields.

I suppose the subordinating clause "the peasants claim" plays the role of an inserted sentence. If I take that out, the sentence will become:

The government is sending a team of agronomists to remote areas to look into cooperative farming techniques that have greatly improved their (the peasants') crop yields.

If my analysis is positive, I would like to ask whether the blue word "that" plays both the roles of...



  1. the conjunction as well as the subject of have greatly improved their crop yields.



  2. the conjunction as well as the object of the peasants claim.
Please advise.

I have another thought. How about...

The government is sending a team of agronomists to remote areas to look into cooperative farming techniques that the peasants claim that they have greatly improved their crop yields.

Does this sound better? I am still confused with the original sentence's structure. Can someone help please?