When I was taking a Biology class in 2005, we were assigned to do an animal experiment.

So what is wrong with that sentence? I am using a free grammar checker website and it says the tense is wrong.

  • 4
    I'm afraid what's wrong is that you are using a free grammar checker website. (Not trying to be snarky, 'tis the truth.) I am also not quite sure where Past Perfect Continuous comes in. I am not seeing it anywhere. Is that what the grammar checker suggests?
    – RegDwigнt
    Dec 13, 2013 at 10:07
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    Assuming 'class' means course here (although in the UK 'taking a class' usually means you're teaching the said group), there is a mismatch between 'I' and 'we' that is strictly an anacoluthon. But then most elliptical sentences are. Perhaps 'when' is seen as inappropriate: 'At one point during the biology course I attended in 2005, we students were required to carry out an animal experiment.' Dec 13, 2013 at 11:14
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    @Edwin: I don't see anything wrong with the mismatch between "I" and "we" here. Dec 13, 2013 at 14:12
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    As @RegDwigнt points out, NO automatic grammar checker ever gives correct results. Don't use them, don't trust them, don't believe what they say. They are just crappy string-based software with no connection to real English grammar. Since people will believe anything about language and "correctness", anybody can write this stuff with any output and people will use it and trust it. This is not as good as learning English grammar. Dec 13, 2013 at 17:40
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    @Edwin: the "our" in "our class" is just as lacking in referent as the "we" in the OP's sentence. Dec 13, 2013 at 18:12

1 Answer 1


If grammar checker were perfect, there'd be no need for ELU. You've identified a bug in the program you are using. There is no error.

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