Hey Ryota! Great question. I have never seen a Canadian or an American Native speaker write this way before, either online or in a text message. Dropping words is OK, but it is only specific things: I'm good --> "Good." I'm looking forward to it --> "Looking forward to it" I'll do that --> "Will do." (Americans don't use "could do" or "would do" or "might do." Only "will do.") Perhaps Harry has some insight here in terms of the texting habits of British folks, but personally I wouldn't recommend ever texting "is okay" or "am good." To my eyes, they look 100% wrong—but again, I'm speaking about Canadian and American English.

When people text "is okay" or "am good," it's super informal. It's alright for casual chats with friends, but it's not correct. Rather than "is okay," you should say "it's okay." Instead of "am good," you should say "I'm good."

Hi Ryota, To answer your question yes, these phrases are informal but correct. People often text back with things like "is okay" or "Am good." They're casual ways of saying "it's okay" or "I'm good." In everyday conversation or texting, it's perfectly fine to use these phrases because they're straightforward and convey the message quickly. For instance, if someone asks how you're doing, you might reply with "Am good, cheers!" I hope this answers your question :)

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