А если не надо с I can-то можешь написать ещо вот так
My grandpa has a very big farmhouse.
In Londan is biulding a largest bridge.
In my garden grow many beautiful flowers.
My horse's name is Snow-white.
After he had put on his winter coat, he went outside. Before he went outside, he had put on his winter coat.
After Artemis had watched her favourite programme, she turned off the TV. Before Artemis turned off the TV, she had watched her favourite programme.
After the boys had played rugby, they rode their bikes home. Before the boys rode their bikes home, they had played rugby.
After Mr Newton had packed his bags, he took taxi to the airport. Before Mr Newton took taxi to the airport, he had packed his bags.
After they had saved enough money, they bought a house. Before they bought a house, they had saved enough money.
если нужно использовать только формулу " I can..." , то:
I can build a farmhouse.
I can go across the bridge.
I can dig in the garden.
I can ride a horse.