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1) [line 1] YESH ZIKAH
See Background to Yevamos 51:1

3) [line 13] TENAI KAFUL (The two-sided conditional statement)
(a) It is possible to make a condition in all Kinyanim (acquisitions; the word Kinyan connotes a change of ownership or status, such as sales, gifts, Gitin and Kidushin) such that the Kinyan will not take effect unless one or both of the parties involved fulfill the specified condition. However, the Torah established that not all conditional statements are valid. Rather, the wording of the conditional statement must follow a specific formulation (Kidushin 61a):
(b) According to those who rule that a Tenai Kaful is required, it must be double-sided ("Tenai Kaful"; i.e. both the positive and the negative sides of the condition must be explicitly stated) and the positive side must precede the negative side. For example, "If you do such and such, the Kinyan will take effect; *and if not, the Kinyan will not take effect.* (There is a Tana who argues, ibid., and does not require that a conditional statement be double-sided, since the inverse may be inferred from the first half of the statement -- mi'Clal Hen Atah Shome'a Lav.) Another requirement is that statement of the condition must precede the statement of the action.
(c) The format for conditional statements is learned from the condition that Moshe Rabeinu made with the men of the tribes of Gad and Reuven. They received portions in the land of Ever ha'Yarden (modern-day Jordan) on condition that they fight alongside the other tribes in the wars of conquest of Eretz Yisrael proper (Kidushin 61a).
(d) There are Rishonim who write that even according to the opinion that a double-sided statement is necessary, it is not necessary under all circumstances:

1. According to some, if the words "Al Menas" ("on the condition that...") are included in the words of the conditional statement, it is considered as if the statement is double-sided, and the second side need not be stated explicitly (RAMBAM Hilchos Ishus 6:17).
2. There are those who are of the opinion that the rules governing the working of a Tenai only apply to Gitin and Kidushin, but not to sales and gifts (see RAMBAM and RA'AVAD Hilchos Zechiyah u'Matanah 3:8).

4) [line 29] CHALITZAH PESULAH TZERICHAH L'CHAZER AL KOL HA'ACHIN
See Background to Yevamos 51:2

5) [line 38] KULAH BEISA B'LAV KAI
According to Rebbi Yochanan, after one brother performs Chalitzah, all of his dead brother's wives are forbidden to him and the other brothers by the Lav of "Lo Yivneh Es Beis Achiv" - "He shall not build his brother's house" (Devarim 25:9). The original Lav and Kares that prohibit one's brother's wife, "Ervas Eshes Achicha Lo Segaleh," (Vayikra 18:16) is removed. According to Reish Lakish, this Lav only applies to the Choletz and the Chalutzah. The original Lav and Kares still prohibit all of the dead brother's other wives to the Choletz, and all of the wives to the other brothers (Yevamos 10b).

7) [line 36] NESINAH (THE NESINIM)
(a) In the times of Yehoshua, the Giv'onim (one of the seven nations whom the Jewish People were commanded to destroy upon entering Eretz Yisrael) came and presented themselves before Yehoshua as if they came from a far-off land. Since they claimed not to be residents of Eretz Yisrael, they requested to be converted and to make peace with the Jewish People. After Yehoshua agreed to accept them, it was discovered that they were one of the seven prohibited nations. Having already accepted them, Yehoshua did not want to break his oath and covenant with them (even though they tricked him and the oath was uttered in error) so as not to cause a Chilul HaSh-m. Yehoshua accepted them and appointed them to be woodchoppers and water drawers to supply the needs for the sacrificial service on the Mizbe'ach (Yehoshua 9:3-27). In the times of Moshe Rabeinu Giv'onim also came to be converted as they did in the times of Yehoshua, and Moshe also made them woodchoppers and water drawers (Yevamos 79a, based on Devarim 29:10). These people became known as "Nesinim," (from the root "Nasan," to give) since they were "given over" by Moshe and Yehoshua ["va'Yitenem..." - "And he appointed them..." (Yehoshua 9:27)] to perform the tasks of chopping wood and drawing water.
(b) The Nesinim are not permitted to marry someone who was born Jewish, just like Mamzerim. RASHI and TOSFOS (Kesuvos 29a and elsewhere) argue as to whether they are prohibited mid'Oraisa or mid'Rabanan. We find that the Gemara (Yevamos 79a) states that Moshe Rabeinu "decreed" regarding the Nesinim of his generation, and Yehoshua extended the "decree" to last as long as the Mishkan or Beis ha'Mikdash would stand. David ha'Melech later extended the "decree" to include all time, even if the Beis ha'Mikdash would be destroyed (because of the trait of cruelty that the Nesinim exhibited, which showed that they were not worthy of uniting with the descendants of Avraham, Yitzchak and Yakov). According to Rashi, these decrees were prohibitions against marriage, and as such the prohibition against marrying Nesinim is an Isur mid'Rabanan. According to Tosfos, these decrees were appointments of servitude. The prohibition against marrying them, though, is mid'Oraisa, since the Torah commands against marrying the seven prohibited nations even if they convert to Judaism (Yevamos 76a).

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