Present simple instead of present perfect

One of 95 rules YabLab tracks in English writing.

A typical slip

We are friends since we were children.

We have been friends since we were children.

The rule

Present simple instead of present perfect

Grammar shows how words depend on one another. A correct form must express the intended person, number, gender, case, time or degree and agree with the rest of the sentence.

Find the head
Start with the controlling word The subject controls the verb; a noun can control its article, adjective or pronoun.
Read the context
Choose the intended meaning Time, quantity, identity and comparison determine which grammatical form is possible.
Check agreement
Match every dependent form Person, number, gender and case must remain consistent across the phrase or clause.

What YabLab does with this mistake

  1. Catches it right as you write — comments, email, docs.
  2. Explains the why in your language, not just the fix.
  3. Helps you practice it until it is gone for good.