YOU SAID:
Hello! I am happy to see you all!
INTO JAPANESE
こんにちは!皆さんにお会いできてうれしいです!
BACK INTO ENGLISH
Hello! I'm glad to meet you!
INTO JAPANESE
こんにちは!私はあなたに会えてうれしいです!
BACK INTO ENGLISH
Hello! I'm glad to meet you!
You've done this before, haven't you.