This phrase is correct and can be used in written English.
It is typically used to describe a word or phrase that cannot stand alone in a sentence and must be used with another word or phrase to convey a complete meaning. For example, "The word 'because' cannot be used alone as a sentence, it needs to be followed by a clause or phrase to make sense."
It has been concluded that the mass-damping parameter cannot be used alone to define critical response, and that for analytical models to be useful they must include amplitude dependent effects which will predict "lock-in" behaviour which has been characterised here by the peak factor.
Based on the results shown here, we conclude that although TbHSP70 cannot be used alone to diagnose trypanosomiasis, it might be a useful component of a multiplex diagnostic containing several immunogenic proteins.
These findings suggest that geophysical methods cannot be used alone as a method to assess the appropriate ranges of riverbed Kv.
The radiation extinction coefficient cannot be used alone to determine the heat regeneration effects in the design of ceramic foam burners.
We show empirically on three commodity indexes that although synthetic diversification cannot be used alone to gain larger geometric returns, it can be used to reduce correlation to other asset classes, such as equities, and potentially increase returns in a larger portfolio of investments.
Several materials cannot be used alone because of high optical losses.
Tumor size alone cannot be used as the only defining criteria for highly curable endometrial carcinomas.
Although these are complete sentences, they cannot be used as stand-alone sentences in your paper.
For this reason, RFA alone cannot be used to treat nodular BE or early esophageal cancer.
The results indicate that ladle slag fines cannot be used as cementing material alone because of the presence of free lime in ladle slag.
It is clear that Determine TB-LAM cannot be used as a stand-alone test but has a potentially important role as an add-on test within the diagnostic algorithm.
