How to switch from imessage to textmessage? (iphone)?

I just wanted to ask how to send an iMessage as a text message.
whenever i want to message my dad it sends it as imessage automatically.
but sometimes he doesn't get mine (i don't know why but this is not relevant) so i wanted to know how to send it as a text message to him? I get his messages as text message but i can't seem to text him back!
I tried everything.

You can just usually hold the 'send' button for a second and it'll turn green. Or if that doesn't work which i doesn't all the time you can usually press and hold the Imessage that won't send then select the option 'send as text message'

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