1 Maybe Ryan didn't get your email (might) Ryan
your email.
2 Nearly all my friends have got smartphones (most)
my friends have got smartphones.
Helen definitely wasn't asleep whenIphoned (can't)
3
whenIphoned
Helen
4 These two phones are really nice (both)
phones are really nice
5 There was no milk in the fridge (any)
milk in the fridge​

Ryan might not have got your email.

Most my friends have got smartphones.

Helen can't have been asleep when I phoned her.

Both phones are really nice.

There wasn't any milk in the fridge.

Ryan might not have got your email.  (Может - might)

Most my friends have got smartphones.  (Большинство - most)

Helen can't have been asleep when I phoned her.

Both phones are really nice.  (Оба - both)

There wasn't any milk in the fridge. (any - некоторые, используется при отрицание в предложении)