Thursday, April 27, 2017

Hydrogen was substituted by oxygen.  -- oxygen was used
Hydrogen was substituted for oxygen.  -- hydrogen was used

 substitute A for B -- this means A takes the place of B -- use A
- substitute B for A -- B takes the place of A -- use B
- B was substituted for A -- B takes the place of A -- use B
- A was substituted for B -- A takes the place of B -- use A

- substitute A with/by B -- B takes the place of A -- use B
- substitute B with/by A -- A takes the place of B -- use A
- A was substituted with/by B -- B takes the place of A -- use B
- B was substituted with/by A -- A takes the place of B -- use A

- substitute for sy/sg -- sy/sg is replaced by X = X replaces sy/sg = replace sy/sg with X

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