Question

3- example: can
in extreme cases, can lead to internal bleeding, organ failure and death...
Can in the sentence below means...........................

4- example: could
...before the doctor could take a look at my blood count.
Could in the sentence below means

nessas frases acima como can e could se encaixa na frase, que modalidade se encaixa ex:

1 example: couldn‟t
Because of the excess of patients, he was told he couldn’t get a blood count test for another day or two …
Couldn’t in the sentence below means impossibility.

Answer 1

in extreme cases, can lead to internal bleeding, organ failure and death... 
Can in the sentence below means possibility