는 거 많다

there's a lot of that kind of thing

거 is casual for 것 'thing', a -는 clause says which kind, and 많다 says there are plenty: 파리바게트에 맛있는 거 많거든요 'Paris Baguette has loads of good things', 유튜브에 점 보는 거 많잖아요 'there are lots of fortune-telling videos on YouTube'. With a verb about a person it counts their behaviour: 저 실수하는 거 많죠 'I make a lot of mistakes', 바라는 거 많네! 'you want a lot, don't you!'.

Register: casual