There are two types of computer searches. One is the global1 search,2 in which the computer locates every occurrence3 of the search string you specify (in this case, Tom Jones) and substitutes a replacement string (Armena Gonzales) throughout4 the manuscript. A search string—5the string of characters you are searching for—5can be a group of words6, a single word, a part of a word, or even a single character. Note that your computer sees spaces the same as it sees other characters; therefore,7 type a space before or after your8 search string only when it's9 a necessary part of what you10 need to find and replace. The alternative11 search locates the search string you specify and asks you to approve each change before actually making it. This is a safer, but12 much slower, process.

1. The word “globel” should be spelled “global.”
2. A nonrestrictive relative clause should be preceded by a comma, whereas a restrictive clause normally is not. The main clause of this sentence is “One…search.” The prepositional phrase “in which” is a modifier of the verb “locates” inside the nonrestrictive relative clause “in which…manuscript.”
3. The word “ocurrence” should be spelled “occurrence.”
4. The adverb “through” indicates passage from one end or boundary to another. The adverb “throughout” means “everywhere,” which more correctly reflects the meaning here.
5. The defining complementary phrase “the string…for” can be set apart using em dashes, commas, or parentheses, but the same punctuation is required at each end of the phrase. En dashes (shown at the beginning of the phrase) may not be used for this purpose.
6. The possessive form “word’s” has been incorrectly used here. The plural form “words” should be used.
7. Use a semicolon to join two independent clauses together with a conjunctive adverb (therefore) and follow the adverb with a comma.
8. Homophones are words (often confused) that sound alike even if they differ in spelling, meaning, or origin, such as “you’re” and “your.” The correct choice in this case is “your.”
9. The term “it’s” is a contraction of “it is” or “it has,” while “its” is a possessive pronoun; “it’s” is the correct usage here.
10. Delete the repeated word “you.”
11. The adjective “alternate” means "a substitute." The noun “alternative” implies a choice between two things and refers to the other choice, as in this example.
12. Commas used to set off dependent clauses (in this case, “but much slower”) are placed at the beginning and the end of the clause. If the clause begins with a coordinating conjunction (in this case, “but”), the beginning comma precedes the conjunction.