Are all my text messages going through?

I'm texting someone with an old iphone. They need Wi-Fi to get messages.Sometimes they send as blue sometimes as green. I get that the blue messages are imessage and green are sms but are all of them going through eventually?
so far all of them have been responded to except my last message and i don't know if they got it or not but i don't want to be annoying by like sending it again or a question mark or something, which is why i'm asking here

No

Blue have gone through green haven't.

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