Organized prayer in the synagogue with less than 10 people - community or not?

Question

Inspired by this question.

There are parts of prayer that are not said when praying alone.

Some examples (please add any I missed):

• Friday Night: Birchat Me-in Sheva

• Shabbos Day before Mussaf: Yekum Purkan, Mi Sheberach

• Kaddish, Barchu, Torah reading, Chazarat Ha-Shatz (Repetition of the Amida)

When praying in the synagogue at the scheduled time together with less than 10 people (in other words not enough people showed up to make the Minyan), do you say these prayers or not. Each of those prayers have a communal aspect. Is this considered enough of a community to say the prayers or not?

In a similar vein, the Chabad custom is that an individual says the Shema Prayer, he repeats ani Hashem Elokeichem. When praying with a Minyan, the chazan repeats "Hashem Elokeichem emes". When leading a service with less than 10 men, how does the chazan finish off the Shema? This same question would apply to congregations who have the custom to say "kel melech neeman" before Sh'ma if praying alone whereas the chazan repeats "Hashem elokechem emes" when praying with a minyan.

Answer 1

I'm a bit perplexed by the question (see my comment to the question), but here are some points to consider:

1. when an individual prays, angels carry his prayers up to the heavens. According to the Gemora, angels don't understand Aramaic. Now, when there is a minyan, Hashem himself is present. Hence, there are many tefilos that are in Aramaic (such as Yekum Purkan) that we only say when there is a Minyan. For more on this concept, see here
   UPDATE: the above isn't as clear cut as it seems and is a Machlokes at best. Another reason that Yekum Purkan isn't said without a minyan is because it's a brocha/tefillah for the tzibur, and if there is no tzibur - there is no one to daven for! (The first Yekum Purkan is for individual Rabanim/leaders of the generation and hence an individual can say it)
2. Mi Shebarach recited after reading the Torah is an oxymoron - you don't read the Torah with less than a Minyan. In general, I don't believe there is an issue with saying a Mi Sheberach without a minyan, and I believe the Sefardi Rabonim often gives berochos in the form of a Mi Sheberach,
3. Birchas Me-in Sheva is an abridged form of Chazoras Hashatz, and hence the logic should follow that it requires a Minyan
4. Hashem Elokeichem Emes - the reason for repeating that is because there are x-3 amount of words in Shema, corresponding of limbs (or something like that). Hence, we add three words to make up the difference. An apointed Shliach Tzibur can be "motzeh" us with that. As per my comment, I'm not familiar with a Shliach Tzibur sans a minyan.

To summarize: in the absence of a quorum you don't say prayers that require one, you don't say any prayers in Aramaic (even though, as per the link above, it might be acceptable for an individual to pray in the language of his choice)