Look at the image and listen to the sound, which only shows a metronome rhythmic pattern to assimilate the special value group of a triplet in a binary meter with binary subdivision (2/4).

   

Once you have a clear idea of how triplets work, study the scores and practise hand movements to represent the corresponding time signature. Then name the notes aloud while keeping the beat with your hand. It doesn't matter if you start slowly, the idea is that speed is increased with practice.

Now it is time to work with duplets. Look at the image and listen to the sound, which only shows a metronome rhythmic pattern to assimilate the special value group of a duplet in a binary meter with ternary subdivision (6/8).

  

Once you have a clear idea of how duplets work, study the scores and practise hand movements to represent the corresponding time signature. Then name the notes aloud while keeping the beat with your hand. Don't forget the purpose of the exercise is to improve your accuracy and speed.