Learn English – Have ever had vs ever had

The word just can be used in the Present Perfect tense to speak about something that happened a short time ago:

• I have just dropped my pen. Can you help me find it?

"Just" is mostly used in the Present Perfect and comes between the auxiliary verb (have) and the past participle.

Another possible way to say it is to use the set phrase "just now" which means only a moment ago; a little time ago; at this moment.

• I (have) dropped the pen just now. Can you help me find it?

You haven't written a single thing (or word) right.

The line above is a hyperbolic statement written in the Present Perfect, it suggests that when the person began writing, e.g. a message, an assignment, an email etc. up to the moment they paused, they have continually made writing mistakes. It may even suggest that the person has just finished, and the speaker is scrutinizing the piece of writing at that precise moment.

Imagine a person who started writing at 09.00 in the morning and ‘now’ it's 10.30, the person may still be writing or have just finished, but every line in the text contains an error of some sort. A friend who checks their writing for spelling, punctuation, and grammar mistakes (proofreading), might say

Your writing is riddled with mistakes (or errors)

Note, the Present Simple tense is used here because we are stating a fact.

riddle
2. adjective [verb-link ADJECTIVE with noun]
If something is riddled with undesirable qualities or features, it is full of them.

The first sentence, which was written in PP, can also be rewritten as

You didn't write a single thing right

This construction is more common in American English, it doesn't matter if the time is mentioned or not, nor when the writing was completed. For many speakers of AmEng, the event is understood to have occurred at a specified point in time.

However, if the errors are related to typography blunders for instance, writing Queen Elizabeth I instead of Queen Elizabeth II, or writing dosen't instead of doesn't, you would call that a typo. Typos include spelling and punctuation inaccuracies that typically occur when someone types fast on a keyboard.

If the information given is incorrect for instance, someone writes that Queen Elizabeth I married Sir Francis Drake, you would say that statement was "completely wrong". In fact, she never married.