Which sentence has an error in subject-verb agreement? The importance of Fleming's discovery wasn't realized right away. It wasn't until about 1940 that penicillin became widely used in medicine. Since then, penicillin has cured some diseases that once killed millions of people. Fleming was very lucky. But he wouldn't have succeeded if he hadn't been working hard on experiments anyway. His discoveries was a combination of luck and hard work.

The sentence that has an error in subject-verb agreement is:

His discoveries was a combination of luck and hard work.

Explanation:

When we say a subject and a verb have to agree, we mean the verb must be inflected in accordance to the subject. If the subject is singular, the verb must also be singular. If the subject is plural, the verb is also plural. The verb "to be", especially, is quite an irregular verb, and requires due attention.

Having that in mind, we can say the sentence that contains an error is "His discoveries was a combination of luck and hard work." The noun "discoveries" is the main word of the subject, and it is plural. However, the verb "was" (past form of the verb "to be") can only be used for singular subjects. For the sentence to be correct, it should be:

His discoveries were a combination of luck and hard work.

it probably should so i can spam dank memes

even though there may be variations in human emotions over time, the poem “ a contribution to statistics” by wislawa symborska suggests that the only unchangeable characteristic is mortality.

the author poses a distinction between the approximate and non-approximate numbers which correspond to our need for certainty in life and the difficulty of achieving it. our efforts to measure the exact often fail because the world is not always clearly structured .the poem seems to imply   that the only thing that is certain and has an exact number is death.