The Dagesh in the Gimmel is a Lene (not preceded by a vowel), but the Dagesh in the Dalet is preceded by a vowel that is not a Sheva, so this must be a forte.
A Forte in what appears to be \(R_2\) Should get your attention
The two questions you should start asking when you see a Forte in \(R_2\):
“Is this Piel?”
“Is this an assimilated נ1” - if you clearly see \(R_1\) you can rule out this option
\(Pre =\) גִּדַּ, distinctly Piel Perfect
\(Sufformative =\) נוּ, Perfect 1cp
\(Root =\)גדל
\(V_S = A\) - We might expect Tsere in the Piel, but then we remember that Piel Perfect takes Patach in 1st/2nd person
Result: Piel Perfect 1cp, we made great
Word: אֲדַבֶּר
Immediately, note the Dagesh in \(R_2\)
Your mind should immeadetly be asking, “is this Piel?”
Potentially, this could be an assimilated 1-nun verb, but we already have what appear to be three-root letters visible
Then remember “Piel-Pael” and note this rhymes with Pael. So without doing much analysis, we’re already pretty sure this is a Piel, non-Perfect.
\(Pre =\) אֲדַבּ,
We expect \(V_P = ə\) in the Piel; but, as we know, the Aleph takes the Hateph vowel instead of Sheva
The Patach+Dagesh+Tsere combination is consistent with Piel non-Perfect
\(Sufformative =\) None. With the Aleph preformative, this is I1cs
\(Root =\)דבר
\(V_S = \bar E\), consistent with Piel (except DP1/2 person)
Result: Piel Imperfect 1cs I will speak
Word: לַמֵּד
The Dagesh Forte in \(R_2\) suggests Piel or assimilated 1-Nun
Of the verb examples on this page, this is the only one where a 1-nun might be plausible
We have the ל, which is a common prefix to an infinitive construct
If there was a verb נמד, we might want to probe this further as a possible ∞, but we don’t know a verb נמד
Even if this were a 1נ verb,, the vowels don’t match up
We DO know a verb למד though
Like in other areas of life, when we have a set of multiple possibilities, the most direct path is often the correct one
You also note that the word rhymes with “Pael”, suggesting a “working hypothesis” of Piel, non-perfect
\(Pre =\) לַמּ,
\(Sufformative =\) none. No preformative, no sufformative could be QP, but the vowels don’t match Qal at all. The vowels do match Piel.
This can’t be DP because \(V_1 \not = I\)
This can’t be DI because all Imperfects have a preformative