Posted by rfvv on Wednesday, September 3, 2014 at 8:31am.

1. It was great fun last weekend for you to visit our nursing home.

2. Your visiting our nursing home was great fun last weekend.

3. The visit was great fun last weekend.

4. Visiting our nursing home was great fun last weekend.

(Are they all grammatical and interchangeable? Or which ones are acceptable grammatically?)
English - Writeacher, Wednesday, September 3, 2014 at 8:58am
All are grammatically correct.

#s 1 and 3 are probably most likely to be used in normal speech.

#s 2 and 4 are slightly awkward even though they're grammatically fine.

English - Anonymous, Wednesday, September 3, 2014 at 9:02am
they are all grammatcal and interchangeable. 1 $ 2 the best
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Thank you for your help.

1-1. It was great fun last weekend.

In this sentence, what does 'last weekend' modify? Is 'last weekend' an adverbial phrase?

In the sentence "It was great fun last weekend," the phrase "last weekend" is functioning as an adverbial phrase. Adverbial phrases provide additional information about when, where, why, or how something happened in a sentence. In this case, "last weekend" is providing information about when the great fun occurred.