Найти в каждом предложение глагол, определить их видовременную форму и укажите их инфинитив.

My native town is Grodno. It's an ancient town. Not long ago it celebrated its 850th anniversary. the town of Grodno is situated on the river Neman. The older part of the town lies on the right bank of the Neman. Here you can see the old castle where kings once lived. Now it is a museum of history and archeology.

Is-глагол to be в Present Indefinite (Simple) Active.

В следующем предложении тоже Is и всё так же.

celebrated-to celebrate в Past Indefinite (Simple) Active

is situated-to situate в Present Indefinite (Simple) Passive.

lies-to lie в Present Indefinite (Simple) Active

can - модальный глагол can в Present Indefinite (Simple)

see-Present Simple Infinitive

lived-глагол to live в Past Indefinite (Simple) Active

Последний глагол снова is, про него уже написано.