Propositions in sentences

1.We gathered many muthrooms in the forest.
2. Masha opened the door and went into the house. There isn't anybody in the house. [Better to say, "There's no one in the house"] The bears were in the forest. Masha saw a table in the room. She went to the table. There are three plates on the table. [As individual sentences, they are ok but sounds very contrite.  Better to write more naturally as, "In the room, Masha saw a table with three plates and went to it.]
3. Butter is on the table. Put it into the fridge. and now sit down at the table. There is juice in the this glass. After drinking it and she placed put the glass it on the shelf [after washing].
4. He jumped into the river and swimed swam quiсkly to the island.
5. She came to the blackboard, took a piece of chalk and began to write on the blackboard.
6. She poured water into a vase and before putting in the floweres into it. Then she went to the window and put the vase on the windowsill.
7. Nik came into the kitchen and sat at the table. Mummy Mother was staying at by the stove. She came to the table, put placed a cup on the table and poured tea into it the cup.