there be句型基本用法 — 英语情景题

读对话，补全所缺句子（每空填 there is 或 there are）。在学校的操场上，Sam 和 Lily 正在聊天： Lily: Look at our playground, Sam. It's very big. Sam: Cool! (1)________ two football goals on the playground. Lily: Yes. And (2)________ a tall tree behind the goal. Sam: I see it. Is there a swing under the tree? Lily: No, there isn't. But (3)________ many flowers near the tree. Sam: How nice! I love your school.