1 to ascertain

2 to act on

3 to criticize

4 to pass on

5 classifier for batches, lots, military flights

6 tier (for the ranking of universities and colleges)

1 to change

2 to alter

3 to transform

4 to correct

1 to make better

2 to improve

3 classifier: 个 gè

1 to change into

1 to change

2 to alter

3 to transform

1 complete change from the old rut (idiom); dramatic change of direction

2 a volte-face

3 to change old practices

1 to change one's plan all of a sudden (idiom)

1 to get right to the heart of the matter (idiom)

1 change of string, move out of rut (idiom); dramatic change of direction

2 to dance to a different tune

1 to reform and start afresh (idiom); to turn over a new leaf