I am learning Academic English. At one lesson, I found the following sentences:
- Some people have been accusing X of starting it.
- X have been pushing for more efforts to prevent this possibility.
I am confused about these sentences. At school, we learned that after have been we used the past perfect verb. However, in the last two sentences, we use verb+ing.
Is there any explanation, when I need to use have been + past perfect verb and have been + verb + ing?