Commentary for Berakhot 42:3
במאי קא מפלגי מר סבר יחיד אומר קדושה ומר סבר אין יחיד אומר קדושה
In what do they differ ? The former is of the opinion that the individual says the "Sanctification," whereas the other is of the opinion that the individual does not say it.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Therefore being able to say it individually, Rab Huna allows him up to "We give thanks unto Thee" in which to say the Tefillah.
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
It must be said with the Congregation ; therefore if he cannot say the Tefillah before making the responses, he should not commence it.
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