May I know which is correct? A: 1. The accuracy and precision has been improved. 2. The accuracy and precision have been improved. B: 1. Microsoft Excel and Microsoft Word is very useful. 2. Microsoft Excel and Microsoft Word are very useful.

Nope, i just copy it from the reference I have. But it is possible the reference has typo=)

Hi CalifJim, >> (You may substitute that for which in the first sentence above.) Do you mean .. included ... attacks which designed to frustruate ... is not correct but .. included ... attacks that designed to frustruate ... is correct?

Another way, (when it is) is not there, why should we imagine there is some words there? Sorry, I am new to this structure, thus I do not 100% understand your explanation.

Thanks, but the word (when it is ) is not there, thus how do we decide whether to use the past participle - compared ?

For the following sentences I see on a book: "Compared to the amount of space required for storing paper proposals, saving those information in digital format only requires a relatively small amout of space. " May I know Why it is using

I see the following sentence in a reference paper: "The test included simulated virus attacks designed to frustrate a spam filter." May I know why it is using "designed" rather than "was designed"?

May I know for the following sentences, which are more correct? And what is the reason? Things to notice is (1)Whether to put the or not (2)Whether it is shown in or shown as In the document, the important points are shown in bold, while the

Hi the following url is a text is from a reference http://tinyurl.com/5bq2x4 I wish to know that For Spam block It is a noun + verb combo, is it a valid sentence structure? If yes why it is?

May I know for the sentences below, which is correct? This is to make him happy and joyful. This is to make him happy and to make him joyful. (I am not sure when we should repeat the verb after the conjunction "and", can someone give me