Yes, they can as stated by USCIS on February 21st, 2018. Except for F3, this is an advantage:
The first five months of the fiscal year (October 2017 to February 2018) have seen limited progression for F1, except for the month of January. March is another disappointing month, and it is hard to maintain belief in F1. You can check out the details of our F1 predictions.
Fiscal Year 2018 has been a solid year for F2A so far. March is another solid month, even if it is a bit below expectations. You can checkout the details of our F2A predictions.
The positive step forward that we witnessed in February is confirmed in March, and that is very good news for F2B. You can checkout the details of our F2B predictions.
Another month beating expectations for F3. The Fiscal Year 2018 is shaping up to be above average. We are likely to revise our prediction upward for F3 if the trend is confirmed in April. You can checkout the details of our F3 predictions.
After a very slow start of the fiscal year, the solid step forward in February is confirmed in March. Great news.. You can also checkout our F4 predictions.