1. He dug at the river bottom.

2. He dug the river bottom.

(Which one is correct?)

3. Hippo dived into the river, but he hit the water too hard.
(What other expressions can we use instead of 'hard'?)

4. Hippo dug and dug.
5. Hippo kept digging.
6. Hippo continued digging.
7. Hippo continued to dig.
8. Hippo dug on and on.
9. Hippo dug continuously.

(Are they all the same in meaning? Thank you for your help.)

1. He dug at the river bottom.

2. He dug the river bottom.

(Which one is correct?) Both could be correct, but in light of the sentences below, I think the first one is what you mean. When you say digging the river bottom, it usually means someone (or a large company) is digging out the river bottom to make it deeper so larger boats and ships can get through. The second one also implies the use of some big dredging machine. " target="_blank">http://en.wikipedia.org/wiki/Dredging

3. Hippo dived into the river, but he hit the water too hard.
(What other expressions can we use instead of 'hard'?)
Is "Hippo" a proper name? Or are you referring to a hippopotamus in general? If it's the latter, then you need to write "A hippo ... " or "The hippo ... "

4. Hippo dug and dug.
5. Hippo kept digging.
6. Hippo continued digging.
7. Hippo continued to dig.
8. Hippo dug on and on.
9. Hippo dug continuously.

All are fine, whether you use the article in front of "hippo" or not.

PS -- "hit the water too hard" is the best expression here. You could also write that he did a belly-flop, but it doesn't mean exactly the same thing. Close, but not exact.

Hippo!!

1. Both sentences are technically grammatically correct, but they convey slightly different meanings.

In "He dug at the river bottom," the word "at" suggests that the person was digging in the area around the river bottom, rather than actually digging the river bottom itself.

In "He dug the river bottom," the word "the" implies that the person was actively digging the river bottom, literally excavating it.

Therefore, the correct sentence depends on the intended meaning. If you want to convey that the person was digging the river bottom, then "He dug the river bottom" is the appropriate choice. If you want to convey that the person was digging around the river bottom, then "He dug at the river bottom" is the better option.

2. Instead of using the word "hard" in the sentence "Hippo dived into the river, but he hit the water too hard," you can use various other expressions to describe the impact. Some alternatives include:

- He hit the water forcefully.
- He hit the water with great impact.
- He hit the water with a strong blow.
- He hit the water vigorously.

These alternatives help to convey the intensity or strength of the impact, instead of using the word "hard" directly.

3-9. The sentences "Hippo dug and dug," "Hippo kept digging," "Hippo continued digging," "Hippo continued to dig," "Hippo dug on and on," and "Hippo dug continuously" all convey a similar meaning. They all indicate that Hippo was engaged in the action of digging persistently and without interruption.

While the wording may differ slightly, the essence of the message remains the same across these sentences. They all indicate a continuous action of digging.