Grammar refers to the usage of words in sentences. The sentence given above which is; "Mary was acting on your instructions and now that things have gone wrong you're blaming her," is not grammatically correct.
- This sentence is not grammatically correct because your intention is to signify a contrast of situations. To accomplish your aim, "But," instead of "And" should be used.
- "But" will drive home the message that a contrast is being stated. Grammar affects the structure and flow of words in a sentence.
- The flow of words in the sentence above was not quite right because there was a change in situations that should have been highlighted with a but.
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