He
(think/a
lready) about what he is
going to need for the
experiment

He (buy) a video camera for his father last winter.

they (have) breakfast together two days ago?Yes,

​

He  has a lready thought about what he is  going to need for the  experiment

He bought a video camera for his father last winter.

Did they had breakfast together two days ago?Yes,

He has already thought about what he is going to need for the experiment.

He bought a video camera for his father last winter.

— Did they have breakfast together two days? — Yes, they did.