frequency

https://tts.langeek.co/read?text=ZnJlcXVlbmN5&hash=536ac58794f528590236dd417390d4c31b1babc7&lang=en&cache-only=0

seldom

https://tts.langeek.co/read?text=c2VsZG9t&hash=4cdcdc4fc8f197a8cf6b70518dc9e5deab8c130f&lang=en&cache-only=0

rarely

https://tts.langeek.co/read?text=cmFyZWx5&hash=85af3acf538d981dde67329b527b6fd4b98f1e68&lang=en&cache-only=0

(every|) once in a while

https://tts.langeek.co/read?text=ZXZlcnkgb25jZSBpbiBhIHdoaWxl&hash=9fda5b1d53fd86e00cf29a8956ab06708165138f&lang=en&cache-only=0

every now and then

https://tts.langeek.co/read?text=ZXZlcnkgbm93IGFuZCB0aGVu&hash=5b2e039d2ad823f93c65b2e5e669fb424c9803ab&lang=en&cache-only=0

every so often

https://tts.langeek.co/read?text=ZXZlcnkgc28gb2Z0ZW4&hash=f8f5064798388fe82424850ccbcf03ff5af5f35d&lang=en&cache-only=0

more often than not

https://tts.langeek.co/read?text=bW9yZSBvZnRlbiB0aGFuIG5vdA&hash=4fd96fdf59226404de8998aec36487767a8711bd&lang=en&cache-only=0

Here you will find the vocabulary from Unit 2 - 2A in the Face2Face Upper-Intermediate coursebook, such as "frequency", "every so often", "seldom", etc.