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Dear Teachers,

1. Spending too many hours in the classroom setting may even put you off the language.

- What does "put you off" mean here?

2. I have only come across two Teachers who were really excellent.

- What does "come across" mean here?

3. I've heard many good things about Germany, and hope to visit in sometimes.

- I think "in" is redundant here, right?

4. - May you two live happily together forever.

- May you two be happy together forever.

- Are these natural?

5. May you two grow old together.

- What does "grow old" mean here?

Thanks very much to Teachers,

Stevenukd.
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1. Spending too many hours in the classroom setting may even put you off the language.

- What does "put you off" mean here?

Make you not want to learn the language anymore. Lose interest.

2. I have only come across two Teachers who were really excellent.

- What does "come across" mean here?

Found, met. In this case, possibly "studied with".

3. I've heard many good things about Germany, and hope to visit in sometimes.

- I think "in" is redundant here, right?

Right.

4. - May you two live happily together forever.

- May you two be happy together forever.

- Are these natural?

They sound fine as part of a toast or speech. They would be very infrequently used in normal conversation

5. May you two grow old together.

- What does "grow old" mean here?

Live long and stay together.
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Vorpar2. I have only come across two Teachers who were really excellent.

I know this isn't your original sentence, but the only is misplaced, and the t should be lower case in teachers.

I have come across only two teachers who were really excellent.