The negative of can is cannot

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  • We use can to say that someone has the ability or opportunity to do something. The negative of can is cannot (contraction: can't). Can you swim? He can play the guitar. It's nice today. We can sit in the garden. I can't open this bottle. could for the italicized verbs if possible. 1. We had a good time yesterday. We went to the zoo. The children enjoyed themselves very much. They saw polar bears and elephants. (No substitution of 'could' is possible.) 2. When I lived in St. Louis, I went to the zoo whenever I wanted to, but now I live in a small town...

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  • At an international Consensus Conference held in 1991 at the offices of the International Olympic Committee in Lausanne, a small group of experts conducted a comprehensive review of the available information and concluded that ‘Diet significantly influences athletic performance’. This statement is unequivocal: what we eat and drink, how much we consume and when it is consumed can all have positive or negative effects on performance in training and in competition.

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  • Genomics and other "omics” technologies have largely contributed to the identification and the development of biomarkers. Due to genetic causes of variability among individuals, genotyping and gene expression analysis are indeed key elements of the emergence of personalised medicine. However, genomic technologies have limitations (functional significance of genetic variants, false negatives, etc) and cannot encompass all approaches for the development of stratification biomarkers.

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  • Di®erent types of numbers ¯nd di®erent application in the physical world. Whole numbers work well for counting discrete objects, such as the number of resistors in a circuit. Integers are needed when negative equivalents of whole numbers are required. Irrational numbers are numbers that cannot be exactly expressed as the ratio of two integers, and the ratio of a perfect circle's circumference to its diameter (¼) is a good physical example of this.

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  • Theimpactonthenaturalhabitatisofgreatconcernatpresent.Increasingdemandcouldforce thedestructionofnaturalhabitats,breedinggrounds,removalofwintercover,shelterbedsfor somespecies.Mechanizationofagriculturesawthedestructionofnests,burrows,etc.Similar impactbutwithgreaterintensitycanbeexpectedtoresultfromenergycropplantations. Extendingenergycropfarmingintounusable,nonagriculturallandcanhaveanegativeimpact on that particular eco system.

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