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Diamondrg Posted 20 years ago
Grammar
tense sequence
Brazilian scientists ---- (crack) the genetic code of a parasite that ---- (menace) California's vineyards. The team says it is the first time the US has asked a developing country to sequence the genome of an organism.
1- Could you please fill in blanks with the most suitable forms of the verbs given in brackets?
2- Can you explain why "cracked / has menaced" is not possible? Does "cracked" mention something which was done before "has menaced"? if so, can we generalize that present perfect can't be before simple past in the timeline (just for a confirmation. I know before past is past perfect.) or at least can present perfect be in the same point as simple past in the time line, though present perfect cannotbe located exactly?
1- Could you please fill in blanks with the most suitable forms of the verbs given in brackets?
2- Can you explain why "cracked / has menaced" is not possible? Does "cracked" mention something which was done before "has menaced"? if so, can we generalize that present perfect can't be before simple past in the timeline (just for a confirmation. I know before past is past perfect.) or at least can present perfect be in the same point as simple past in the time line, though present perfect cannotbe located exactly?
Top answer
You'd better put the original text to make clearer what you are asking. "Brazilian scientists have cracked the genetic code of a parasite that is menacing California's vineyards. The team says it is the first time the US has asked a developing country to sequence the genome of an organism.
- You'd better put the original text to make clearer what you are asking.
- "Brazilian scientists have cracked the genetic code of a parasite that is menacing California's vineyards.
- The team says it is the first time the US has asked a developing country to sequence the genome of an organism.
- The bacterium, Xylella fastidiosa, causes Pierce's disease in a range of crops including grapes, almonds and coffee, killing plants from California to Argentina.
- The sequencing project was led by Marie-Anne Van Sluys at the University of Sao Paulo (Journal of Bacteriology, vol 185, p 1018).
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1 Answers
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You'd better put the original text to make clearer what you are asking.
"Brazilian scientists have cracked the genetic code of a parasite that is menacing California's vineyards. The team says it is the first time the US has asked a developing country to sequence the genome of an organism. The bacterium, Xylella fastidiosa, causes Pierce's disease in a range of crops includi
"Brazilian scientists have cracked the genetic code of a parasite that is menacing California's vineyards. The team says it is the first time the US has asked a developing country to sequence the genome of an organism. The bacterium, Xylella fastidiosa, causes Pierce's disease in a range of crops includi
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