it has been...

[ahmin92]

1.The dog..

It has been eating dog foods for months.

2.The GPS..

it works great so far.

3.Me..

It has been a long time that I didn't speak English
I have been promoted to Associate Professor.
I have been doing this all the time.
I have been dancing since I was 8.

Are my sentences all correct? When should I use -ed after *have been*? Is there any possible that I have to use -en after *have been* ?

[bhaisahab]

1.The dog..

It has been eating dog foods for months. Delete "s".

2.The GPS..

It works great so far.

3.Me..

It has been a long time since I spoke English
I have been promoted to Associate Professor.
I have been doing this all the time.
I have been dancing since I was 8.

Are my sentences all correct? When should I use -ed after *have been*? Is there any possible that I have to use -en after *have been* ?

Bhai.