In the English Vocabulary Profile at C1 ‘happen + to-infinitive‘ = do something by chance
A search in the NOW corpus for:
HAPPEN to _VVI
1 HAPPEN TO KNOW 1453
2 HAPPEN TO LIVE 1430
3 HAPPENED TO SEE 1172
4 HAPPEN TO THINK 1147
5 HAPPENED TO COME 1132
6 HAPPEN TO GET 1104
7 HAPPEN TO FIND 875
8 HAPPENED TO GET 828
9 HAPPENED TO COINCIDE 812
That heartbreaking Friday night also just happened to coincide with the tragic death of close teammate Stewart Loewe‘s sister in a car accident.
10 HAPPEN TO SEE 776
11 HAPPEN TO MAKE 769
12 HAPPENED TO MEET 687
13 HAPPEN TO LIKE 658
14 HAPPEN TO BELIEVE 615
15 HAPPENED TO FALL 556
16 HAPPENS TO LOOK 521
17 HAPPEN TO COME 511
18 HAPPENS TO COME 510
19 HAPPENS TO COINCIDE 479
20 HAPPENED TO MAKE 458