Learn different expressions from someone who can speak tigrgna each day and make sure u use them. It's very similar to amharic so it wont be hard. a lot of the words sound like mispronounced amharic lol like 'tegebku' for instance is 'tsegibe', ....'temrialehu' is 'temahire' ....and 'denaderachu' is 'dehan dehaderkum' ... im learning tigrigna from my mom ena u should know that the eritirean tigrigna is a little different from the ethiopian one. Theirs is mixed with italian and arabic (my mom was born and raised in Eritrea that's why i know) ena there's a subtle difference in the accent as well. the ethiopian tigrigna has a stronger throaty accent so for amharic natives, i think learning the eritrean tigrigna is easier