Y U NO TALK? 99% issues of this manga could have been solved if people were:
Using full sentences instead of shortened ones, e.g. for the question "Which apples do you like: red or green ones?"answered "I like red apples" instead of "red".
Asking questions instead of trying to figure things out:
Onodera: I saw you took a picture of Chitoge, is it because you started to fall in love with her even though you're just pretending to date each other?
Ichijirou: No, actually, it's because you're undressing on this photo and I wanted to take it to the teacher to take it down, see?
Onodera: Oh, right.
Ichijirou: Actually, here, take it to the teacher yourself. This way you won't have to trust my word and will be sure that I didn't snatch this picture for myself.
Onodera: Thank you, you're such a nice guy! This your trait is one of the reasons I've been in love with you for the past 50 years even though I'm just 15 years old, wanna marry me?
Confirming important things: "Unclear communication has already given us quite a few awkward moments in the past. So just to make sure, we're talking about X, right? - No, actually, I was talking about Y. - Oh, right. Now all what you said before finally makes sense".
Actually continuing interrupted conversation: "Hey, I've been meaning to ask you for quite some time alrea- OH MY GOSH A BALL HAS BROKEN THE WINDOW WE'RE STANDING IN FRONT OF / SOMEBODY CALLED ONE OF US / A WILD UFO APPEARED - and we can't brush it off or ask someone else to handle this situation! Well, let's forget about what we were going to talk for about 10-100 more chapters".