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用现在进行时描述图片，并正确使用介词及冠词。
When is Tree Planting Day?
March 12
Planting trees is important for everyone.
D. Water the young tree.
A. Dig a hole.
C. Fill the hole with earth.
B. put the young tree into the hole.
How to plant a tree ?
How to plant a tree ?(four steps)
A. Dig a hole.
B. put the young tree into the hole.
D. Water the young tree.
C. Fill the hole with earth.
—What is the man doing?
—He is a hole.
digging
Tip Top
We use the present continuous tense to describe what is happening in photos or pictures.
Now make conversations about what is going on in the pictures with the words in brackets.
S1: What is/ are … doing?
S2: …
S1:What are two workers doing?
S2:Two workers are digging holes in the ground.
S1:What is another worker doing?
S2：Another worker is planting a tree in a hole.
S1: What is/ are … doing?
S2: …
S1:What are two workers doing?
S2:Two workers are carrying a large container.