1. There is nothing wrong with 'method'; 'form' is a worse choice. 2.
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1. There is nothing wrong with 'method'; 'form' is a worse choice.
2. 'To some degree' is inappropriate and should be deleted.
3. 'The past few years' is fine; 'recent past years' is wrong. 'Seen' is right; 'shown' is wrong. 'For' is right; 'of' is wrong. 'A move back' is strange; I would expect 'a return' perhaps.
4. 'Several' is OK, but you need to insert 'of': 'sever