Your sentence is grammatically correct, but it is not particularly natural. People generally would not use such a passive sentence. Using the active voice would be far better: "Tom has been solving the problems for 15 minutes."

Hi A few comments to your question... Traditionally, ESL students have been taught passive tense by adding "by" to an agent in the sentence. This rule can be misleading, or at least proved confusing to some learners. Not

Previous climbers had cut steps in the ice. R: The ice the climbers got had cut steps . Steps ... ... ... by previous climbers. We use this room only on special occasions. R: On special occasions we used this room. This room ... ... ... They Are

(1) In the United States, you may say "I have three hats" or "I have got three hats." They both mean the same. In the United States, "I have gotTEN three hats = I have just acquired or obtained them. (2) "I will have

By 'the agent', I mean the subject of an active sentence, or the object of 'by' in a passive sentence.

2. My father painted the house. The house was painted by my father. 3. The storm will destroy the harvest. The harvest was will be destroyed by the storm. 4. He has knocked the fence over. The fence was has been knocked over by him. 5. The man

Hi there, I am just wondering if I have re-worded these sentences correctly. The first group of sentences have to be changed from active to passive, and the sencond group from passive to active. My answer will be in Italic and bolded. I believe

Thank you. You wrote/corrected (with your comment): 2. This seminar could prove beneficial to those who haven't attended a school in the past. -- In the right context you could say this but as a standalone sentence the article

I vote for " I have done" Be + Pass Participle ("am done") sound like a passive sentence e.g. The painting was done by Picasso. The painting was done with oils on canvas. No, sorry. "I have done" is the one version of the

I vote for " I have done" Be + Pass Participle ("am done") sound like a passive sentence e.g. The painting was done by Picasso. The painting was done with oils on canvas.