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1.4. Already/Just/Still/Yet
We most often use the adverbs "already", "just", "still" and "yet" with the present perfect, although they may be used with other verb tenses.
1.5. For/Since/Ago
We use "for", "since" and "ago" to express a relationship with time. These adverbs can be used with various verb tenses. "For" y "since" respond to the question: "How long...
1.6. Modal Perfects
As we saw in the inicial lesson on modal verbs, these verbs express modality, such as possibility and probability.
