Question

Is this correct: However, in the 1300s, as preventive measures have become discovered, most doctors recommended these methods or purifying the air to prevent plague: 1. Burn richly scented incense. 2. Fill the house with flowers. 3. Sprinkle the floors with vinegar. 4. Request that doctors must wear a bird mask with perfume in the beak.

Answer 1

I apologize. It seems I have accidentally mislabeled my question.

Answer 2

What is your question?

Answer 3

Is the sentence I have written above grammatically correct?

Answer 4

The only change I recommend is to change the tense in this sentence.

as preventive measures have become discovered,

as preventive measures had become discovered,

Answer 5

Thank you.

Answer 6

You're welcome.